CISA description
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.
CVE-2024-40891
Zyxel · DSL CPE Devices
Zyxel DSL CPE OS Command Injection Vulnerability
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.
Notes & references
- 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-2024-40891
Where this lands in 800-53
Vulnerability data triggers these controls during assessment and continuous monitoring.