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
- Jun 17, 2026
- 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
Affected packages
Proof-of-concept & exploitation references
1 foundWeaponization
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.
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).
Is there exploit tooling available for CVE-2024-40891?
We found 1 public GitHub repository referencing CVE-2024-40891, though none matched a known Nuclei template or Metasploit module at last check. Review each one before relying on it - see the proof-of-concept section above.
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
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