Zyxel DSL CPE OS Command Injection Vulnerability
Zyxel — VMG4325-B10A firmware
**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.
8.8
21.5%
Vector breakdown
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Published
- Feb 4, 2025
- Modified
- Oct 21, 2025
- Added to KEV
- Feb 11, 2025
- Federal patch due
- Mar 4, 2025
CISA required action
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.
Weakness classification
Proof-of-concept & exploitation references
Weaponization
Public repositories whose name or description references CVE-2024-40891, found via a live GitHub search at request time. These are community-sourced signals, not a verified working exploit — cross-check each one before relying on it, and treat higher star counts and recent activity as (weak) corroboration, not proof.
No public GitHub repositories referencing CVE-2024-40891 were found at last check. Absence here is not proof no exploit exists — see the references below for vendor advisories and write-ups.
References
How this class of flaw gets exploited
Frequently asked questions
What is CVE-2024-40891?
**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.
How severe is CVE-2024-40891?
CVE-2024-40891 has a CVSS base score of 8.8 out of 10 (CVSS 3.1).
Is CVE-2024-40891 actively exploited in the wild?
Yes. CVE-2024-40891 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added Feb 11, 2025, meaning CISA has confirmed evidence of active exploitation.
What is the EPSS score for CVE-2024-40891?
21.5% - meaning FIRST.org's EPSS model estimates a 21.5% probability this vulnerability will be exploited in the wild within 30 days (97% percentile among all scored CVEs).
What type of vulnerability is CVE-2024-40891?
CVE-2024-40891 is classified under CWE-78 (CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')).
Cross-checked against
Impactr finds and proves whether CVE-2024-40891 — or flaws like it — are actually reachable in your own web apps and APIs, with a reproducible exploit as evidence.