CASCACascade Atlas

Evidence dossier

CVE-2024-40891

CVE-2024-40891

71.4–86.4Priority evidence range
As known Jul 19, 2026, 5:00 AM UTCgen-56ccdaf9

Normalized restatement

**UNSUPPORTED WHEN ASSIGNED** A post-authentication command injection vulnerability in the management commands of the legacy DSL CPE Zyxel VMG4325-B10A firmware version 1.00(AAFR.4)C0_20170615 could allow an authenticated attacker to execute operating system (OS) commands on an affected device via Telnet.

State
PUBLISHED
Published
Feb 4, 2025
Updated
Oct 21, 2025
Evidence coverage
85%
CISA KEVCatalog member

The impacted product could be end-of-life (EoL) and/or end-of-service (EoS). Users should discontinue product utilization if a current mitigation is unavailable.

FIRST EPSS22.00%

2026-07-18 · v2026.06.15 · percentile 97.4%

Source stateNo scored conflict

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

Source comparison

Who said what

CISA-ADPindependent enrichment
container

CISA ADP Vulnrichment

Zyxeloriginal assertion
container

**UNSUPPORTED WHEN ASSIGNED** A post-authentication command injection vulnerability in the management commands of the legacy DSL CPE Zyxel VMG4325-B10A firmware version 1.00(AAFR.4)C0_20170615 could allow an authenticated attacker to execute operating system (OS) commands on an affected device via Telnet.

CISA KEVoriginal assertion
observed_exploitation

Zyxel DSL CPE OS Command Injection Vulnerability

FIRST EPSSoriginal assertion
model_probability

Probability 0.219960000000; percentile 0.973930000000

Applicability

Cited product scope

Trace impact →
ZyxelVMG4325-B10A firmware
[{"status": "affected", "version": "<= 1.00(AAFR.4)C0_20170615"}]unknown
Unknown vendorUnknown product
cpe:2.3:h:zyxel:sbg3300-n000:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:zyxel:sbg3300-nb00:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:zyxel:sbg3500-nb00:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:zyxel:vmg1312-b10a:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:zyxel:vmg1312-b10b:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:zyxel:vmg1312-b10e:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:zyxel:vmg3312-b10a:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:zyxel:vmg3313-b10a:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:zyxel:vmg3926-b10b:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:zyxel:vmg4325-b10a:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:zyxel:vmg4380-b10a:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:zyxel:vmg8324-b10a:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:zyxel:vmg8924-b10a:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:o:zyxel:sbg3300-n000_firmware:-:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:zyxel:sbg3300-nb00_firmware:-:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:zyxel:sbg3500-n000_firmware:-:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:zyxel:sbg3500-n000_firmware:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:o:zyxel:sbg3500-nb00_firmware:-:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:zyxel:vmg1312-b10a_firmware:-:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:zyxel:vmg1312-b10b_firmware:-:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:zyxel:vmg1312-b10e_firmware:-:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:zyxel:vmg3312-b10a_firmware:-:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:zyxel:vmg3313-b10a_firmware:-:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:zyxel:vmg3926-b10b_firmware:-:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:zyxel:vmg4325-b10a_firmware:-:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:zyxel:vmg4380-b10a_firmware:-:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:zyxel:vmg8324-b10a_firmware:-:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:zyxel:vmg8924-b10a_firmware:-:*:*:*:*:*:*:*supported

Assessments

CVSS by origin

8.8
security@zyxel.com.twCVSS 3.1 · role SecondaryCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.8
ZyxelCVSS 3.1 · role unknownCVSS:3.1/AV:N/AC:L/PR:L/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.