CVE-2024-40891highunder attackCWE-78

CVE-2024-40891: high-severity vulnerability in Zyxel VMG4325-B10A firmware

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56Vexday Risk Score

Prioritize patching. It under exploitation confirmed by CISA.

ssvc Actcvss 8.8epss 23%
from disclosure to weapon
Published on NVDFeb 4
CISA KEV+7d
Action required by CISAfederal deadline: 2025-03-04

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.

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.

The full analysis of this CVE is available in Portuguese →

**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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