CASCACascade Atlas

Evidence dossier

CVE-2020-29583

CVE-2020-29583

83.5–99.0Priority evidence range
As known Jul 19, 2026, 5:00 AM UTCgen-56ccdaf9

Normalized restatement

Firmware version 4.60 of Zyxel USG devices contains an undocumented account (zyfwp) with an unchangeable password. The password for this account can be found in cleartext in the firmware. This account can be used by someone to login to the ssh server or web interface with admin privileges.

State
PUBLISHED
Published
Dec 22, 2020
Updated
Oct 21, 2025
Evidence coverage
72%
CISA KEVCatalog member

Apply updates per vendor instructions.

FIRST EPSS90.05%

2026-07-18 · v2026.06.15 · percentile 99.8%

Source stateConflict visible

Distinct CVSS assessments remain side by side; none are averaged.

Source comparison

Who said what

CISA-ADPindependent enrichment
container

CISA ADP Vulnrichment

CVEderivative copy
container

CVE Program Container

mitreoriginal assertion
container

Firmware version 4.60 of Zyxel USG devices contains an undocumented account (zyfwp) with an unchangeable password. The password for this account can be found in cleartext in the firmware. This account can be used by someone to login to the ssh server or web interface with admin privileges.

CISA KEVoriginal assertion
observed_exploitation

Zyxel Multiple Products Use of Hard-Coded Credentials Vulnerability

FIRST EPSSoriginal assertion
model_probability

Probability 0.900490000000; percentile 0.997820000000

Applicability

Cited product scope

Trace impact →
n/an/a
[{"status": "affected", "version": "n/a"}]unknown
Unknown vendorUnknown product
cpe:2.3:h:zyxel:atp100:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:zyxel:atp100w:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:zyxel:atp200:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:zyxel:atp500:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:zyxel:atp700:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:zyxel:atp800:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:zyxel:usg110:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:zyxel:usg1100:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:zyxel:usg1900:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:zyxel:usg20-vpn:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:zyxel:usg20w-vpn:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:zyxel:usg210:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:zyxel:usg2200:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:zyxel:usg310:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:zyxel:usg40:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:zyxel:usg40w:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:zyxel:usg60:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:zyxel:usg60w:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:zyxel:usg_flex_100:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:zyxel:usg_flex_100w:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:zyxel:usg_flex_200:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:zyxel:usg_flex_500:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:zyxel:usg_flex_700:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:zyxel:vpn100:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:zyxel:vpn1000:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:zyxel:vpn300:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:zyxel:vpn50:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:zyxel:zywall110:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:zyxel:zywall1100:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:zyxel:zywall310:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:o:zyxel:atp100_firmware:4.60:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:zyxel:atp100w_firmware:4.60:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:zyxel:atp200_firmware:4.60:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:zyxel:atp500_firmware:4.60:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:zyxel:atp700_firmware:4.60:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:zyxel:atp800_firmware:4.60:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:zyxel:usg1100_firmware:4.60:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:zyxel:usg110_firmware:4.60:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:zyxel:usg1900_firmware:4.60:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:zyxel:usg20-vpn_firmware:4.60:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:zyxel:usg20w-vpn_firmware:4.60:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:zyxel:usg210_firmware:4.60:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:zyxel:usg2200_firmware:4.60:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:zyxel:usg310_firmware:4.60:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:zyxel:usg40_firmware:4.60:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:zyxel:usg40w_firmware:4.60:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:zyxel:usg60_firmware:4.60:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:zyxel:usg60w_firmware:4.60:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:zyxel:usg_flex_100_firmware:4.60:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:zyxel:usg_flex_100w_firmware:4.60:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:zyxel:usg_flex_200_firmware:4.60:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:zyxel:usg_flex_500_firmware:4.60:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:zyxel:usg_flex_700_firmware:4.60:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:zyxel:vpn1000_firmware:4.60:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:zyxel:vpn100_firmware:4.60:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:zyxel:vpn300_firmware:4.60:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:zyxel:vpn50_firmware:4.60:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:zyxel:zywall1100_firmware:4.60:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:zyxel:zywall110_firmware:4.60:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:zyxel:zywall310_firmware:4.60:*:*:*:*:*:*:*supported

Assessments

CVSS by origin

9.8
nvd@nist.govCVSS 3.1 · role PrimaryCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
10.0
nvd@nist.govCVSS 2.0 · role PrimaryAV:N/AC:L/Au:N/C:C/I:C/A:C
9.8
134c704f-9b21-4f2e-91b3-4a467353bcc0CVSS 3.1 · role SecondaryCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8
CISA-ADPCVSS 3.1 · role unknownCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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 is unknown in Public Core because no accepted canonical mapping-obligation ledger is present.
  • Core replay supports the active and immediately prior generation; retrospective valid-at replay is deferred.