Zyxel EX3301-T0 up to 5.50(ABVY.7)C0 Log File Download os command injection

Summaryinfo

A vulnerability described as critical has been identified in Zyxel EX3301-T0 up to 5.50(ABVY.7)C0. The impacted element is an unknown function of the component Log File Download Handler. Executing a manipulation can lead to os command injection. The identification of this vulnerability is CVE-2025-13943. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability classified as critical was found in Zyxel EX3301-T0 up to 5.50(ABVY.7)C0. This vulnerability affects an unknown code block of the component Log File Download Handler. The manipulation with an unknown input leads to a os command injection vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

A post-authentication command injection vulnerability in the log file download function of the Zyxel EX3301-T0 firmware versions through 5.50(ABVY.7)C0 could allow an authenticated attacker to execute operating system (OS) commands on an affected device.

This vulnerability was named CVE-2025-13943 since 12/03/2025. The exploitation appears to be easy. The attack can be initiated remotely. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 02/24/2026). The MITRE ATT&CK project declares the attack technique as T1202.

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

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Productinfo

Vendor

• Zyxel

Name

• EX3301-T0

Version

• 5.50(ABVY.7)C0

License

• commercial

Website

• Vendor: https://www.zyxel.com/

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