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Exploited vulnerability · CISA KEV

Is CVE-2024-40891 exploited? Yes: in CISA KEV since 11 Feb 2025

Gociux · Zyxel DSL CPE Devices · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2024-40891, Zyxel DSL CPE OS Command Injection Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 11 Feb 2025, 7 days after it was published. It affects Zyxel DSL CPE Devices, an internet-facing product of the kind attackers use for initial access. If you run it, CISA's required action is: 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.

exploitedYesCISA KEV · 11 Feb 2025
ransomwareNot knownno confirmed use
EPSStop 5%very likely to be exploited
severity8.8CVSS 3.1 · high
US federal due4 Mar 2025BOD 22-01 deadline

What it is

Multiple Zyxel DSL CPE devices contain a post-authentication command injection vulnerability in the management commands that could allow an authenticated attacker to execute OS commands via Telnet.

VendorZyxel (13 exploited CVEs in KEV)
ProductDSL CPE Devices
VulnerabilityZyxel DSL CPE OS Command Injection Vulnerability
WeaknessCWE-78
Published4 Feb 2025
Added to KEV11 Feb 2025
Reported by (CNA)Zyxel

What to do

  1. Check whether you run it. Look for DSL CPE Devices in your asset inventory, including appliances and cloud images. Stack check lists every exploited Zyxel CVE at once.
  2. Apply the fix. 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.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 4 Feb 2025.
  4. Get told next time. Email alerts when CISA adds a CVE for Zyxel.

Other exploited CVEs in DSL CPE Devices

References

Questions

Is CVE-2024-40891 being exploited?

Yes. CISA added CVE-2024-40891 to the Known Exploited Vulnerabilities catalog on 11 Feb 2025, which means there is reliable evidence of exploitation in the wild.

Is CVE-2024-40891 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2024-40891?

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. Check Zyxel's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected DSL CPE Devices and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in February 2025 · Zyxel scorecard · act-now radar.

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