How severe is CVE-2024-40891?

CVE-2024-40891 has a CVSS score of 8.8/10, rated HIGH. Immediate patching is strongly recommended.

Which packages are affected by CVE-2024-40891?

Affected package information for CVE-2024-40891 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2024-40891?

No fixed version has been published for CVE-2024-40891 yet. Monitor the advisory for updates, apply mitigations recommended by the vendor, and use O3 Security to track when a fix becomes available in your stack.

Is CVE-2024-40891 actively exploited in the wild?

No public exploit code has been indexed for CVE-2024-40891 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2024-40891?

CVE-2024-40891 has an EPSS (Exploit Prediction Scoring System) score of 53.2%, placing it in the 98th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. A score above 50% indicates significantly elevated exploitation risk — immediate patching is strongly recommended.

Is CVE-2024-40891 in the CISA Known Exploited Vulnerabilities catalog?

Yes. CVE-2024-40891 (Zyxel DSL CPE OS Command Injection Vulnerability) was added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2025-02-11. CISA required all US federal civilian agencies to remediate this vulnerability by 2025-03-04. The required action was: 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. Being listed in the KEV catalog is the strongest possible confirmation of active exploitation — treat this as a critical priority.

What type of vulnerability is CVE-2024-40891?

CVE-2024-40891 is classified as OS Command Injection (CWE-78). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

Which products and versions are affected by CVE-2024-40891?

CVE-2024-40891 affects zyxel sbg3300-n000 firmware; zyxel sbg3300-nb00 firmware; zyxel sbg3500-n000 firmware; zyxel sbg3500-nb00 firmware, and 10 more product(s). Check the affected-products list on this page against your deployed version to confirm exposure.

When was CVE-2024-40891 published, and has it been updated?

CVE-2024-40891 was published on February 4, 2025 and was last updated on October 27, 2025. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CISA KEV·Added 2025-02-11 — agencies required to remediate by 2025-03-04

CVE-2024-40891

HIGH

**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…

Published

Feb 4, 2025

Updated

Oct 27, 2025

Affected

0 pkgs

Patched

None yet

Exploits

None indexed

EPSS Exploitation Probability

via FIRST.org ↗

53.2%probability of exploitation in next 30 days

High Risk98th percentile0.00%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Description

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.

Affected Products

14 products · 14 configurations

sbg3300-n000 firmwarezyxel

all

sbg3300-nb00 firmwarezyxel

all

sbg3500-n000 firmwarezyxel

all

sbg3500-nb00 firmwarezyxel

all

vmg1312-b10a firmwarezyxel

all

vmg1312-b10b firmwarezyxel

all

Frequently Asked Questions

**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.

O3 Security · Impact-Aware SCA

Is CVE-2024-40891 in your stack?

O3 detects CVE-2024-40891 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

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