CVE-2024-40891

CVSS 8.8 HIGHEPSS 19.4%● KEVCWE-78

In short

An authenticated attacker can execute arbitrary OS commands on a Zyxel DSL modem (model VMG4325-B10A) via Telnet by injecting malicious commands into management functions. This allows complete control over the device after login.

Technical detail

Post-authentication command injection in legacy Zyxel VMG4325-B10A firmware (v1.00(AAFR.4)C0_20170615) allows authenticated users to inject OS commands through Telnet management interfaces (CWE-78). Exploitation requires valid device credentials; successful injection results in arbitrary command execution with device privileges.

Summary generated and translated by AI from the official 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.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

Zyxel · VMG4325-B10A firmware

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References

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-40891 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