Command Injection in Zyxel VMG4325-B10A 1.00(AAFR.4)C0 via Telnet
CVE-2024-40891 Published on February 4, 2025

**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.

Vendor Advisory NVD

Known Exploited Vulnerability

This Zyxel DSL CPE OS Command Injection Vulnerability is part of CISA's list of Known Exploited Vulnerabilities. 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.

The following remediation steps are recommended / required by March 4, 2025: 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.

Vulnerability Analysis

CVE-2024-40891 can be exploited with network access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. This vulnerability is known to be actively exploited by threat actors. The potential impact of an exploit of this vulnerability is considered to be very high.

Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
LOW
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
HIGH
Integrity Impact:
HIGH
Availability Impact:
HIGH

Weakness Type

What is a Shell injection Vulnerability?

The software constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.

CVE-2024-40891 has been classified to as a Shell injection vulnerability or weakness.


Affected Versions

Zyxel VMG4325-B10A firmware Version <= 1.00(AAFR.4)C0_20170615 is affected by CVE-2024-40891

Exploit Probability

EPSS
55.35%
Percentile
98.05%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.