# CASCA evidence receipt — CVE-2023-33009

- Generation: `gen-409cbd0c74ff4feb70e4944e6b98ce40`
- As known: 2026-07-21T08:13:17.697275+00:00
- Comparison: gen-56ccdaf914f7b4be95b689ccae7dc20d
- Score policy: public-priority-v1.0.1
- Conflict: not observed in this generation

## Source assertions

- **CISA-ADP** (independent_enrichment): container — CISA ADP Vulnrichment
  - Observed: 2026-07-19T04:27:06.398189+00:00
  - Citation: https://www.cve.org/CVERecord?id=CVE-2023-33009
- **CVE** (derivative_copy): container — CVE Program Container
  - Observed: 2026-07-19T04:27:06.398189+00:00
  - Citation: https://www.cve.org/CVERecord?id=CVE-2023-33009
- **Zyxel** (original_assertion): container — A buffer overflow vulnerability in the notification function in Zyxel ATP series firmware versions 4.60 through 5.36 Patch 1, USG FLEX series firmware versions 4.60 through 5.36 Patch 1, USG FLEX 50(W) firmware versions 4.60 through 5.36 Patch 1, USG20(W)-VPN firmware versions 4.60 through 5.36 Patch 1, VPN series firmware versions 4.60 through 5.36 Patch 1, ZyWALL/USG series firmware versions 4.60 through 4.73 Patch 1, could allow an unauthenticated attacker to cause denial-of-service (DoS) conditions and even a remote code execution on an affected device.
  - Observed: 2026-07-19T04:27:06.398189+00:00
  - Citation: https://www.cve.org/CVERecord?id=CVE-2023-33009
- **CISA KEV** (original_assertion): observed_exploitation — Zyxel Multiple Firewalls Buffer Overflow Vulnerability
  - Observed: 2026-07-19T04:54:04.25158+00:00
  - Citation: https://www.cisa.gov/known-exploited-vulnerabilities-catalog
- **FIRST EPSS** (original_assertion): model_probability — Probability 0.281440000000; percentile 0.978910000000
  - Observed: 2026-07-19T04:54:35.756809+00:00
  - Citation: https://www.first.org/epss/data_stats.html

## CVSS assessments

- **nvd@nist.gov** (Secondary, CVSS 3.1): 9.8 — score eligible
  - Evidence class: nvd_enrichment_exact; source rank: 0
  - Validation: valid_match
  - Vector: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`
- **security@zyxel.com.tw** (Secondary, CVSS 3.1): 9.8 — score eligible
  - Evidence class: exact_record_cna; source rank: 1
  - Validation: valid_match
  - Vector: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`
- **Zyxel** (unknown, CVSS 3.1): 9.8 — display only
  - Evidence class: direct_cve_record_display_only; source rank: not applicable
  - Validation: display-only direct record assessment
  - Vector: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`

## Applicability scope

- **Zyxel · ATP series firmware** (direct_source; unknown)
  - Versions: [{"status": "affected", "version": "4.60 through 5.36 Patch 1"}]
- **Zyxel · USG20(W)-VPN firmware** (direct_source; unknown)
  - Versions: [{"status": "affected", "version": "4.60 through 5.36 Patch 1"}]
- **Zyxel · USG FLEX 50(W) firmware** (direct_source; unknown)
  - Versions: [{"status": "affected", "version": "4.60 through 5.36 Patch 1"}]
- **Zyxel · USG FLEX series firmware** (direct_source; unknown)
  - Versions: [{"status": "affected", "version": "4.60 through 5.36 Patch 1"}]
- **Zyxel · VPN series firmware** (direct_source; unknown)
  - Versions: [{"status": "affected", "version": "4.60 through 5.36 Patch 1"}]
- **Zyxel · ZyWALL/USG series firmware** (direct_source; unknown)
  - Versions: [{"status": "affected", "version": "4.60 through 4.73 Patch 1"}]
- **zyxel · atp100** (environmental_constraint; constrained)
  - Versions: Version not applicable
  - Canonical identity: `product-1200899350c6986d5c964f597f369618d1abb63616766a4ba3ec511b2ebc27e6`
  - Official link states: linked_exact
  - Criterion (linked_exact, environmental_constraint): `cpe:2.3:h:zyxel:atp100:-:*:*:*:*:*:*:*`
- **zyxel · atp100_firmware** (vulnerable_target; supported)
  - Versions: Any version (unconstrained) (>= 4.60, < 5.36); Version 5.36
  - Canonical identity: `product-a61d6943c1bad48e17a6899eb15990b4a194af3c4c7456d58636c745ce6c0123`
  - Official link states: linked_exact
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:atp100_firmware:5.36:-:*:*:*:*:*:*`
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:atp100_firmware:*:*:*:*:*:*:*:*`
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:atp100_firmware:5.36:patch1:*:*:*:*:*:*`
- **zyxel · atp100w** (environmental_constraint; constrained)
  - Versions: Version not applicable
  - Canonical identity: `product-e89e0034d5de943870101b99bf70729bdf104ab7b27b822fa2c5ad4c217de46c`
  - Official link states: linked_exact
  - Criterion (linked_exact, environmental_constraint): `cpe:2.3:h:zyxel:atp100w:-:*:*:*:*:*:*:*`
- **zyxel · atp100w_firmware** (vulnerable_target; supported)
  - Versions: Any version (unconstrained) (>= 4.60, < 5.36); Version 5.36
  - Canonical identity: `product-6e8453083842a704d3eef10ca166fe4982207762b43dbd869f4d6d6da51c6519`
  - Official link states: linked_exact
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:atp100w_firmware:5.36:-:*:*:*:*:*:*`
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:atp100w_firmware:*:*:*:*:*:*:*:*`
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:atp100w_firmware:5.36:patch1:*:*:*:*:*:*`
- **zyxel · atp200** (environmental_constraint; constrained)
  - Versions: Version not applicable
  - Canonical identity: `product-204c039ba605ff99a732d4aeb892002d51199a5a7289e8fc9a6195251cd09d02`
  - Official link states: linked_exact
  - Criterion (linked_exact, environmental_constraint): `cpe:2.3:h:zyxel:atp200:-:*:*:*:*:*:*:*`
- **zyxel · atp200_firmware** (vulnerable_target; supported)
  - Versions: Any version (unconstrained) (>= 4.60, < 5.36); Version 5.36
  - Canonical identity: `product-d262d95a9d2b47c5c7875f791f3c6fa9d5d2b48a0a40750bed16cd94cd692f89`
  - Official link states: linked_exact
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:atp200_firmware:*:*:*:*:*:*:*:*`
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:atp200_firmware:5.36:patch1:*:*:*:*:*:*`
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:atp200_firmware:5.36:-:*:*:*:*:*:*`
- **zyxel · atp500** (environmental_constraint; constrained)
  - Versions: Version not applicable
  - Canonical identity: `product-2aadc23472d0134ca1a46a96d237076a2f79c52ee591e309a631af2c09fe5858`
  - Official link states: linked_exact
  - Criterion (linked_exact, environmental_constraint): `cpe:2.3:h:zyxel:atp500:-:*:*:*:*:*:*:*`
- **zyxel · atp500_firmware** (vulnerable_target; supported)
  - Versions: Any version (unconstrained) (>= 4.60, < 5.36); Version 5.36
  - Canonical identity: `product-51aff2d0b03d80e26b46d437c992b29e60a2d3fc16c8471fd199c9d23383d177`
  - Official link states: linked_exact
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:atp500_firmware:5.36:-:*:*:*:*:*:*`
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:atp500_firmware:*:*:*:*:*:*:*:*`
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:atp500_firmware:5.36:patch1:*:*:*:*:*:*`
- **zyxel · atp700** (environmental_constraint; constrained)
  - Versions: Version not applicable
  - Canonical identity: `product-cea0f4a3423fb565b7fc5420cfee82db0edf528bf9235d8292671f6e8ae64fe8`
  - Official link states: linked_exact
  - Criterion (linked_exact, environmental_constraint): `cpe:2.3:h:zyxel:atp700:-:*:*:*:*:*:*:*`
- **zyxel · atp700_firmware** (vulnerable_target; supported)
  - Versions: Any version (unconstrained) (>= 4.60, < 5.36); Version 5.36
  - Canonical identity: `product-e80ae947ef2fbf604a1685f7dbf5e9c3fecc4edde631c371210a3a8519233fb1`
  - Official link states: linked_exact
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:atp700_firmware:5.36:-:*:*:*:*:*:*`
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:atp700_firmware:*:*:*:*:*:*:*:*`
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:atp700_firmware:5.36:patch1:*:*:*:*:*:*`
- **zyxel · atp800** (environmental_constraint; constrained)
  - Versions: Version not applicable
  - Canonical identity: `product-3d53771a3239415f970ae3ae39ad7aea35c319c755ea6e942a0f4add01901eb2`
  - Official link states: linked_exact
  - Criterion (linked_exact, environmental_constraint): `cpe:2.3:h:zyxel:atp800:-:*:*:*:*:*:*:*`
- **zyxel · atp800_firmware** (vulnerable_target; supported)
  - Versions: Any version (unconstrained) (>= 4.60, < 5.36); Version 5.36
  - Canonical identity: `product-c0379851b411c8239197abf9661f20e966d7560c151b11c7647d2508bf2f7e92`
  - Official link states: linked_exact
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:atp800_firmware:5.36:patch1:*:*:*:*:*:*`
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:atp800_firmware:5.36:-:*:*:*:*:*:*`
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:atp800_firmware:*:*:*:*:*:*:*:*`
- **zyxel · usg20-vpn** (environmental_constraint; constrained)
  - Versions: Version not applicable
  - Canonical identity: `product-0bd1e78fe15d29edcff9915f0cb954cead37cc7f3e9a331745ef4c5f1ac121a4`
  - Official link states: linked_exact
  - Criterion (linked_exact, environmental_constraint): `cpe:2.3:h:zyxel:usg20-vpn:-:*:*:*:*:*:*:*`
- **zyxel · usg20-vpn_firmware** (vulnerable_target; supported)
  - Versions: Any version (unconstrained) (>= 4.60, < 5.36); Version 5.36
  - Canonical identity: `product-e5d0a9b1d297d36bfc243a7683973a65ca9f9b00f5fc83c43caf3713537e09ea`
  - Official link states: linked_exact
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:usg20-vpn_firmware:5.36:-:*:*:*:*:*:*`
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:usg20-vpn_firmware:*:*:*:*:*:*:*:*`
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:usg20-vpn_firmware:5.36:patch1:*:*:*:*:*:*`
- **zyxel · usg_20w-vpn** (environmental_constraint; constrained)
  - Versions: Version not applicable
  - Canonical identity: `product-f9da0300b09cd9131de63e886e3f9279ed620453053ae48caacec872a6bcb053`
  - Official link states: linked_exact
  - Criterion (linked_exact, environmental_constraint): `cpe:2.3:h:zyxel:usg_20w-vpn:-:*:*:*:*:*:*:*`
- **zyxel · usg_20w-vpn_firmware** (vulnerable_target; supported)
  - Versions: Any version (unconstrained) (>= 4.60, < 5.36); Version 5.36
  - Canonical identity: `product-41708052d4077bd8f08bf90364c85016ebd5c219f392954a84ed571d11e2981e`
  - Official link states: linked_exact
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:usg_20w-vpn_firmware:*:*:*:*:*:*:*:*`
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:usg_20w-vpn_firmware:5.36:-:*:*:*:*:*:*`
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:usg_20w-vpn_firmware:5.36:patch1:*:*:*:*:*:*`
- **zyxel · usg_40** (environmental_constraint; constrained)
  - Versions: Version not applicable
  - Canonical identity: `product-dc2434e70cc224f2b01613a8d8b3e207cd628eccb56370b9f7b02bef542e8e53`
  - Official link states: linked_exact
  - Criterion (linked_exact, environmental_constraint): `cpe:2.3:h:zyxel:usg_40:-:*:*:*:*:*:*:*`
- **zyxel · usg_40_firmware** (vulnerable_target; supported)
  - Versions: Any version (unconstrained) (>= 4.60, < 4.73); Version 4.73
  - Canonical identity: `product-de3d811fd5332d78ee2526236da362690657e554712055ff114d2f22d95fb0b0`
  - Official link states: linked_exact
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:usg_40_firmware:4.73:patch1:*:*:*:*:*:*`
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:usg_40_firmware:*:*:*:*:*:*:*:*`
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:usg_40_firmware:4.73:-:*:*:*:*:*:*`
- **zyxel · usg_40w** (environmental_constraint; constrained)
  - Versions: Version not applicable
  - Canonical identity: `product-cc04a557ace4668ce5eb667c49a464ab6884df0cd1473b9ff517fdf939c0bb19`
  - Official link states: linked_exact
  - Criterion (linked_exact, environmental_constraint): `cpe:2.3:h:zyxel:usg_40w:-:*:*:*:*:*:*:*`
- **zyxel · usg_40w_firmware** (vulnerable_target; supported)
  - Versions: Any version (unconstrained) (>= 4.60, < 4.73); Version 4.73
  - Canonical identity: `product-86f99bc9ab4d50c9559bddd263642e189da788ee7e254501649990d1e1771b98`
  - Official link states: linked_exact
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:usg_40w_firmware:4.73:-:*:*:*:*:*:*`
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:usg_40w_firmware:*:*:*:*:*:*:*:*`
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:usg_40w_firmware:4.73:patch1:*:*:*:*:*:*`
- **zyxel · usg_60** (environmental_constraint; constrained)
  - Versions: Version not applicable
  - Canonical identity: `product-315d05c09316a7284229bd14ed2052ec38995d55a46590d263d39284d4ad9c6d`
  - Official link states: linked_exact
  - Criterion (linked_exact, environmental_constraint): `cpe:2.3:h:zyxel:usg_60:-:*:*:*:*:*:*:*`
- **zyxel · usg_60_firmware** (vulnerable_target; supported)
  - Versions: Any version (unconstrained) (>= 4.60, < 4.73); Version 4.73
  - Canonical identity: `product-ba391e813d1ca8f48d81faa487ab68073af1b4115a2cc20d0969358c60e0f9ef`
  - Official link states: linked_exact
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:usg_60_firmware:4.73:patch1:*:*:*:*:*:*`
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:usg_60_firmware:*:*:*:*:*:*:*:*`
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:usg_60_firmware:4.73:-:*:*:*:*:*:*`
- **zyxel · usg_60w** (environmental_constraint; constrained)
  - Versions: Version not applicable
  - Canonical identity: `product-f0221f4b9f10c5ebc86a2b34f558278f2020f7f445814c7c0f486a48d3c458ca`
  - Official link states: linked_exact
  - Criterion (linked_exact, environmental_constraint): `cpe:2.3:h:zyxel:usg_60w:-:*:*:*:*:*:*:*`
- **zyxel · usg_60w_firmware** (vulnerable_target; supported)
  - Versions: Any version (unconstrained) (>= 4.60, < 4.73); Version 4.73
  - Canonical identity: `product-d49cc06bd1694635384653ea5099d635af0950d562113257ca2b986d5033461d`
  - Official link states: linked_exact
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:usg_60w_firmware:4.73:patch1:*:*:*:*:*:*`
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:usg_60w_firmware:*:*:*:*:*:*:*:*`
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:usg_60w_firmware:4.73:-:*:*:*:*:*:*`
- **zyxel · usg_flex_100** (environmental_constraint; constrained)
  - Versions: Version not applicable
  - Canonical identity: `product-70213505d2b8f408c480cab89b9ac09b5fe0d081880dce71e2b038b5834e0be1`
  - Official link states: linked_exact
  - Criterion (linked_exact, environmental_constraint): `cpe:2.3:h:zyxel:usg_flex_100:-:*:*:*:*:*:*:*`
- **zyxel · usg_flex_100_firmware** (vulnerable_target; supported)
  - Versions: Any version (unconstrained) (>= 4.60, < 5.36); Version 5.36
  - Canonical identity: `product-e4ca10df87762079f9b736c8c1995cdeb765fb4ad23b6ecc52f0bcca7fd863e0`
  - Official link states: linked_exact
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:usg_flex_100_firmware:5.36:-:*:*:*:*:*:*`
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:usg_flex_100_firmware:*:*:*:*:*:*:*:*`
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:usg_flex_100_firmware:5.36:patch1:*:*:*:*:*:*`
- **zyxel · usg_flex_100w** (environmental_constraint; constrained)
  - Versions: Version not applicable
  - Canonical identity: `product-e64f051566e72ee8abc4c7cf7c156e863ad218d5c276e00ed48e367f76fc3301`
  - Official link states: linked_exact
  - Criterion (linked_exact, environmental_constraint): `cpe:2.3:h:zyxel:usg_flex_100w:-:*:*:*:*:*:*:*`
- **zyxel · usg_flex_100w_firmware** (vulnerable_target; supported)
  - Versions: Any version (unconstrained) (>= 4.60, < 5.36); Version 5.36
  - Canonical identity: `product-5abdfb839c49688aabb3222f4bc5147ec7b4516467e598cdf06c89143c252874`
  - Official link states: linked_exact
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:usg_flex_100w_firmware:5.36:patch1:*:*:*:*:*:*`
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:usg_flex_100w_firmware:*:*:*:*:*:*:*:*`
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:usg_flex_100w_firmware:5.36:-:*:*:*:*:*:*`
- **zyxel · usg_flex_200** (environmental_constraint; constrained)
  - Versions: Version not applicable
  - Canonical identity: `product-186ec2e7e83ecc39c0cd4f4aab725cf56a83377b1b1f4e40d0fefce00e4a9d1c`
  - Official link states: linked_exact
  - Criterion (linked_exact, environmental_constraint): `cpe:2.3:h:zyxel:usg_flex_200:-:*:*:*:*:*:*:*`
- **zyxel · usg_flex_200_firmware** (vulnerable_target; supported)
  - Versions: Any version (unconstrained) (>= 4.60, < 5.36); Version 5.36
  - Canonical identity: `product-0b2bf582a5aa79942527606012ba4ef11a68ad9abca59a4abf071acaeb96106c`
  - Official link states: linked_exact
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:usg_flex_200_firmware:5.36:-:*:*:*:*:*:*`
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:usg_flex_200_firmware:*:*:*:*:*:*:*:*`
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:usg_flex_200_firmware:5.36:patch1:*:*:*:*:*:*`
- **zyxel · usg_flex_50** (environmental_constraint; constrained)
  - Versions: Version not applicable
  - Canonical identity: `product-7025caa2dd69d9529684ecd695318b3af50756e32c1568668375fa72f8cddf26`
  - Official link states: linked_exact
  - Criterion (linked_exact, environmental_constraint): `cpe:2.3:h:zyxel:usg_flex_50:-:*:*:*:*:*:*:*`
- **zyxel · usg_flex_500** (environmental_constraint; constrained)
  - Versions: Version not applicable
  - Canonical identity: `product-afda088bf23ac862c272dd4f5b5f3637e058cc2d39deaa00cbf718d11c5a5293`
  - Official link states: linked_exact
  - Criterion (linked_exact, environmental_constraint): `cpe:2.3:h:zyxel:usg_flex_500:-:*:*:*:*:*:*:*`
- **zyxel · usg_flex_500_firmware** (vulnerable_target; supported)
  - Versions: Any version (unconstrained) (>= 4.60, < 5.36); Version 5.36
  - Canonical identity: `product-0c7537a3c4e962c61695d9a69c09c71c4706711aff73126318bc69c88e8d810d`
  - Official link states: linked_exact
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:usg_flex_500_firmware:*:*:*:*:*:*:*:*`
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:usg_flex_500_firmware:5.36:patch1:*:*:*:*:*:*`
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:usg_flex_500_firmware:5.36:-:*:*:*:*:*:*`
- **zyxel · usg_flex_50_firmware** (vulnerable_target; supported)
  - Versions: Any version (unconstrained) (>= 4.60, < 5.36); Version 5.36
  - Canonical identity: `product-750c77056e3509254876815ce6785adb86ce7c2ee089bdf23dab5a205a9686fc`
  - Official link states: linked_exact
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:usg_flex_50_firmware:*:*:*:*:*:*:*:*`
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:usg_flex_50_firmware:5.36:patch1:*:*:*:*:*:*`
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:usg_flex_50_firmware:5.36:-:*:*:*:*:*:*`
- **zyxel · usg_flex_50w** (environmental_constraint; constrained)
  - Versions: Version not applicable
  - Canonical identity: `product-c98c837429b0a3aabe411f843bea6a70eb823fac1a98eda667a919cbbd0b46be`
  - Official link states: linked_exact
  - Criterion (linked_exact, environmental_constraint): `cpe:2.3:h:zyxel:usg_flex_50w:-:*:*:*:*:*:*:*`
- **zyxel · usg_flex_50w_firmware** (vulnerable_target; supported)
  - Versions: Any version (unconstrained) (>= 4.60, < 5.36); Version 5.36
  - Canonical identity: `product-936a8a7c943c7226136a60acef772ee4ce5ac143e5655c668b852f5b8d502342`
  - Official link states: linked_exact
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:usg_flex_50w_firmware:5.36:-:*:*:*:*:*:*`
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:usg_flex_50w_firmware:*:*:*:*:*:*:*:*`
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:usg_flex_50w_firmware:5.36:patch1:*:*:*:*:*:*`
- **zyxel · usg_flex_700** (environmental_constraint; constrained)
  - Versions: Version not applicable
  - Canonical identity: `product-f6e93fd108e93ab36a3a91acddd9cd6c1468ff478c0d4161435afa92f05663d7`
  - Official link states: linked_exact
  - Criterion (linked_exact, environmental_constraint): `cpe:2.3:h:zyxel:usg_flex_700:-:*:*:*:*:*:*:*`
- **zyxel · usg_flex_700_firmware** (vulnerable_target; supported)
  - Versions: Any version (unconstrained) (>= 4.60, < 5.36); Version 5.36
  - Canonical identity: `product-e09b599c8ada399dff2b8ab79fd7bbc40401bd2afbe161b152324fc7a13c2c40`
  - Official link states: linked_exact
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:usg_flex_700_firmware:5.36:patch1:*:*:*:*:*:*`
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:usg_flex_700_firmware:5.36:-:*:*:*:*:*:*`
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:usg_flex_700_firmware:*:*:*:*:*:*:*:*`
- **zyxel · vpn100** (environmental_constraint; constrained)
  - Versions: Version not applicable
  - Canonical identity: `product-119f68b467b40fba050097b8ffc5e1da4500523e8db1af58a37ef2a1e9c13555`
  - Official link states: linked_exact
  - Criterion (linked_exact, environmental_constraint): `cpe:2.3:h:zyxel:vpn100:-:*:*:*:*:*:*:*`
- **zyxel · vpn1000** (environmental_constraint; constrained)
  - Versions: Version not applicable
  - Canonical identity: `product-c77a9a4371b6af86f4bb0f9f25fa386743d5ceb42dbb3046ab34bffd45c2e6bb`
  - Official link states: linked_exact
  - Criterion (linked_exact, environmental_constraint): `cpe:2.3:h:zyxel:vpn1000:-:*:*:*:*:*:*:*`
- **zyxel · vpn1000_firmware** (vulnerable_target; supported)
  - Versions: Any version (unconstrained) (>= 4.60, < 5.36); Version 5.36
  - Canonical identity: `product-326008e6d320d68bbeba0496f28a5df816c3b4b5fd083259f33968af444d8583`
  - Official link states: linked_exact
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:vpn1000_firmware:*:*:*:*:*:*:*:*`
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:vpn1000_firmware:5.36:-:*:*:*:*:*:*`
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:vpn1000_firmware:5.36:patch1:*:*:*:*:*:*`
- **zyxel · vpn100_firmware** (vulnerable_target; supported)
  - Versions: Any version (unconstrained) (>= 4.60, < 5.36); Version 5.36
  - Canonical identity: `product-6082442a6083cd87efca032eced3b7c869d191d5abe797ca758b24a14219ab98`
  - Official link states: linked_exact
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:vpn100_firmware:*:*:*:*:*:*:*:*`
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:vpn100_firmware:5.36:patch1:*:*:*:*:*:*`
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:vpn100_firmware:5.36:-:*:*:*:*:*:*`
- **zyxel · vpn300** (environmental_constraint; constrained)
  - Versions: Version not applicable
  - Canonical identity: `product-5489806e0ff3d1f3ef7f260040ddce70fc1baf014f4ccc646a64ebd909a052c8`
  - Official link states: linked_exact
  - Criterion (linked_exact, environmental_constraint): `cpe:2.3:h:zyxel:vpn300:-:*:*:*:*:*:*:*`
- **zyxel · vpn300_firmware** (vulnerable_target; supported)
  - Versions: Any version (unconstrained) (>= 4.60, < 5.36); Version 5.36
  - Canonical identity: `product-73d8643b6be148d5a452006e63a97198060a54c941b1f1e4638cc41687b261d6`
  - Official link states: linked_exact
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:vpn300_firmware:5.36:-:*:*:*:*:*:*`
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:vpn300_firmware:*:*:*:*:*:*:*:*`
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:vpn300_firmware:5.36:patch1:*:*:*:*:*:*`
- **zyxel · vpn50** (environmental_constraint; constrained)
  - Versions: Version not applicable
  - Canonical identity: `product-e1a58012f953e0584f7825ec725d3dad57b8997ec98d9738e612cb47c1422664`
  - Official link states: linked_exact
  - Criterion (linked_exact, environmental_constraint): `cpe:2.3:h:zyxel:vpn50:-:*:*:*:*:*:*:*`
- **zyxel · vpn50_firmware** (vulnerable_target; supported)
  - Versions: Any version (unconstrained) (>= 4.60, < 5.36); Version 5.36
  - Canonical identity: `product-d781087797ffcbc50b6c52eb91f3e346a66c12189f2fe0f9f13d2c13ec28c3f6`
  - Official link states: linked_exact
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:vpn50_firmware:5.36:patch1:*:*:*:*:*:*`
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:vpn50_firmware:5.36:-:*:*:*:*:*:*`
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:zyxel:vpn50_firmware:*:*:*:*:*:*:*:*`

## Identity source boundaries

- **cpe_dictionary**: 1775266 records through 2026-07-21T06:45:29.809553+00:00
  - Run: `27d65b0f-b718-4b4f-bb79-c47c68d09dfa`
- **cpe_match**: 643502 records through 2026-07-21T08:13:17.697275+00:00
  - Run: `955dae73-7302-438b-aee1-058d7cc5d48e`

## Limitations and unknowns

- KEV membership is authoritative for the catalog, not proof of exposure in any environment.
- EPSS is a dated model probability and not an individual-environment prediction.
- Affected or fixed status applies only to the exact cited product and version scope; unresolved scope remains unknown.
- NVD-carried upstream facts remain derivative and are not independent corroboration.
- Only NVD metrics validated under the generation-bound calculator are Public Priority eligible; direct CVE record metrics remain display-only.
- NVD CVSS source eligibility is closed: NVD-authored, exact record-source, or registered same-CVE container origin; unmapped sources remain display-only.
- Factor D remains unknown because WC-03 has not converted canonical CPE mappings into generation-bound mapping obligations; canonical identity alone does not score applicability.
- Core replay supports the active and immediately prior generation; retrospective valid-at replay is deferred.

Generated from CASCA normalized evidence. This receipt is not proof that an asset is affected, unaffected, safe, or fixed.