Zyxel VMG4325-B10A up to 1.00(AAFR.4)C0_20170615 os command injection

Summaryinfo

A vulnerability has been found in Zyxel VMG4325-B10A up to 1.00(AAFR.4)C0_20170615 and classified as critical. This vulnerability affects unknown code. The manipulation leads to os command injection. This vulnerability is referenced as CVE-2024-40891. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability was found in Zyxel VMG4325-B10A up to 1.00(AAFR.4)C0_20170615. It has been rated as critical. This issue affects an unknown part. The manipulation with an unknown input leads to a os command injection vulnerability. Using CWE to declare the problem leads to CWE-78. The product 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. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

**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.

The advisory is shared at zyxel.com. The identification of this vulnerability is CVE-2024-40891 since 07/11/2024. The exploitation is known to be easy. The attack may be initiated remotely. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 07/17/2025). MITRE ATT&CK project uses the attack technique T1202 for this issue.

It is declared as attacked. The vulnerability scanner Nessus provides a plugin with the ID 242167 (Zyxel Legacy DSL CPE Router Multiple Vulnerabilities), which helps to determine the existence of the flaw in a target environment. The CISA Known Exploited Vulnerabilities Catalog lists this issue since 02/11/2025 with a due date of 03/04/2025:

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.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at Zero-Day.cz (954) and Tenable (242167). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Vendor

• Zyxel

Name

• VMG4325-B10A

Version

• 1.00(AAFR.4)C0_20170615

License

• commercial

Support

• end of life

Website

• Vendor: https://www.zyxel.com/

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Discussion