# CASCA evidence receipt — CVE-2020-0796

- Generation: `gen-409cbd0c74ff4feb70e4944e6b98ce40`
- As known: 2026-07-21T08:13:17.697275+00:00
- Comparison: gen-56ccdaf914f7b4be95b689ccae7dc20d
- Score policy: public-priority-v1.0.1
- Conflict: present

## 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-2020-0796
- **CVE** (derivative_copy): container — CVE Program Container
  - Observed: 2026-07-19T04:27:06.398189+00:00
  - Citation: https://www.cve.org/CVERecord?id=CVE-2020-0796
- **microsoft** (original_assertion): container — A remote code execution vulnerability exists in the way that the Microsoft Server Message Block 3.1.1 (SMBv3) protocol handles certain requests, aka 'Windows SMBv3 Client/Server Remote Code Execution Vulnerability'.
  - Observed: 2026-07-19T04:27:06.398189+00:00
  - Citation: https://www.cve.org/CVERecord?id=CVE-2020-0796
- **CISA KEV** (original_assertion): observed_exploitation — Microsoft SMBv3 Remote Code Execution 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 0.998100000000; percentile 0.999570000000
  - Observed: 2026-07-19T04:54:35.756809+00:00
  - Citation: https://www.first.org/epss/data_stats.html

## CVSS assessments

- **nvd@nist.gov** (Primary, CVSS 3.1): 10 — 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:C/C:H/I:H/A:H`
- **nvd@nist.gov** (Primary, CVSS 2.0): 7.5 — score eligible
  - Evidence class: nvd_enrichment_exact; source rank: 0
  - Validation: valid_match
  - Vector: `AV:N/AC:L/Au:N/C:P/I:P/A:P`
- **134c704f-9b21-4f2e-91b3-4a467353bcc0** (Secondary, CVSS 3.1): 10 — score eligible
  - Evidence class: registered_adp_or_other; source rank: 2
  - Validation: valid_match
  - Vector: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H`
- **CISA-ADP** (unknown, CVSS 3.1): 10 — 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:C/C:H/I:H/A:H`

## Applicability scope

- **Microsoft · Windows 10 Version 1903 for 32-bit Systems** (direct_source; unknown)
  - Versions: [{"status": "affected", "version": "unspecified"}]
- **Microsoft · Windows 10 Version 1903 for ARM64-based Systems** (direct_source; unknown)
  - Versions: [{"status": "affected", "version": "unspecified"}]
- **Microsoft · Windows 10 Version 1903 for x64-based Systems** (direct_source; unknown)
  - Versions: [{"status": "affected", "version": "unspecified"}]
- **Microsoft · Windows 10 Version 1909 for 32-bit Systems** (direct_source; unknown)
  - Versions: [{"status": "affected", "version": "unspecified"}]
- **Microsoft · Windows 10 Version 1909 for ARM64-based Systems** (direct_source; unknown)
  - Versions: [{"status": "affected", "version": "unspecified"}]
- **Microsoft · Windows 10 Version 1909 for x64-based Systems** (direct_source; unknown)
  - Versions: [{"status": "affected", "version": "unspecified"}]
- **Microsoft · Windows Server, version 1903 (Server Core installation)** (direct_source; unknown)
  - Versions: [{"status": "affected", "version": "unspecified"}]
- **Microsoft · Windows Server, version 1909 (Server Core installation)** (direct_source; unknown)
  - Versions: [{"status": "affected", "version": "unspecified"}]
- **microsoft · windows_10_1903** (vulnerable_target; supported)
  - Versions: Version not applicable
  - Canonical identity: `product-9868fa1c12254f9aff51c0302ecb2ea1ab1d9ca0547bde09677154b24f8c7c61`
  - Official link states: linked_exact
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:microsoft:windows_10_1903:-:*:*:*:*:*:arm64:*`
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:microsoft:windows_10_1903:-:*:*:*:*:*:x86:*`
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:microsoft:windows_10_1903:-:*:*:*:*:*:x64:*`
- **microsoft · windows_10_1909** (vulnerable_target; supported)
  - Versions: Version not applicable
  - Canonical identity: `product-ef5324dcc791e4e872d6c2be0aefa1d7687ca82c3b4ac5d1f72c76cce8395218`
  - Official link states: linked_exact
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:microsoft:windows_10_1909:-:*:*:*:*:*:arm64:*`
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:microsoft:windows_10_1909:-:*:*:*:*:*:x64:*`
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:microsoft:windows_10_1909:-:*:*:*:*:*:x86:*`
- **microsoft · windows_server_1903** (vulnerable_target; supported)
  - Versions: Version not applicable
  - Canonical identity: `product-14b069f5c38c7de633daa144529d27da601f26ac1be85dea8792e6a0093a122b`
  - Official link states: linked_exact
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:microsoft:windows_server_1903:-:*:*:*:*:*:x64:*`
- **microsoft · windows_server_1909** (vulnerable_target; supported)
  - Versions: Version not applicable
  - Canonical identity: `product-11ee14cb5467893e953fd2afd492aa2a80b330b2831c4c10e31a6d9476b8f7ab`
  - Official link states: linked_exact
  - Criterion (linked_exact, vulnerable_target): `cpe:2.3:o:microsoft:windows_server_1909:-:*:*:*:*:*:x64:*`

## 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.