CVE-2024-40890: in the CISA KEV catalogue
Zyxel DSL CPE OS Command Injection Vulnerability. CISA added CVE-2024-40890 to the Known Exploited Vulnerabilities catalogue on 2025-02-11 with a default due date of 2025-03-04. Known ransomware campaign use: Unknown. Forensic triage flag: No.
Multiple Zyxel DSL CPE devices contain a post-authentication command injection vulnerability in the CGI program that could allow an authenticated attacker to execute OS commands via a crafted HTTP request. (CISA description)
- Vendor / product
- Zyxel DSL CPE Devices
- CWE
- CWE-78
- 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.
- EPSS
- 21%, percentile 97 (scored 2026-11-03)
EPSS puts about 21 in 100 odds (21%) on exploitation activity being observed in the next 30 days. Its score is higher than or equal to that of 97% of scored CVEs. This is a model estimate about exploitation anywhere, not about your environment.
Vendor and reference links (from CISA)
- https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-command-injection-and-insecure-default-credentials-vulnerabilities-in-certain-legacy-dsl-cpe-02-04-2025
- https://www.zyxel.com/service-provider/global/en/security-advisories/zyxel-security-advisory-command-injection-insecure-in-certain-legacy-dsl-cpe-02-04-2025
- https://nvd.nist.gov/vuln/detail/CVE-2024-40890
Your own deadline under CISA BOD 26-04 depends on exposure, automatability and technical impact: work it out with the BOD 26-04 calculator.
Frequently asked questions
Is CVE-2024-40890 in the CISA KEV catalogue?
Yes. CISA added CVE-2024-40890 (Zyxel DSL CPE OS Command Injection Vulnerability) to the Known Exploited Vulnerabilities catalogue on 2025-02-11. CISA's default due date for it is 2025-03-04.
Is CVE-2024-40890 used in ransomware attacks?
CISA marks known ransomware campaign use as Unknown for CVE-2024-40890. That means CISA lacks confirmation, not that ransomware groups do not use it.
What should I do about CVE-2024-40890?
CISA's 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.
Sources
- CISA, Known Exploited Vulnerabilities Catalog (accessed 2026-11-03)
- FIRST, Exploit Prediction Scoring System (EPSS) (EPSS by FIRST; scores generated by Empirical Security)
- NVD record for CVE-2024-40890