Zyxel AX7501-B1 up to 5.17(ABPC.7.2)C0 syslog os command injection

Summaryinfo

A vulnerability has been found in Zyxel AX7501-B1 up to 5.17(ABPC.7.2)C0 and classified as very critical. Impacted is an unknown function of the component syslog. This manipulation causes os command injection. This vulnerability appears as CVE-2026-6952. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability has been found in Zyxel AX7501-B1 up to 5.17(ABPC.7.2)C0 and classified as very critical. Affected by this vulnerability is an unknown part of the component syslog. 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. The summary by CVE is:

A post-authentication command injection vulnerability in the "LogServer" field of the syslog component in Zyxel AX7501-B1 firmware versions through 5.17(ABPC.7.2)C0 could allow an authenticated attacker with administrator privileges to execute OS commands on an affected device.

It is possible to read the advisory at zyxel.com. This vulnerability is known as CVE-2026-6952 since 04/24/2026. The exploitation appears to be easy. The attack can be launched remotely. Additional levels of successful authentication are necessary for exploitation. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 07/21/2026). The attack technique deployed by this issue is T1202 according to MITRE ATT&CK.

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 vulnerability database at EUVD (EUVD-2026-46145). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

• Zyxel

Name

• AX7501-B1

Version

• 5.17(ABPC.7.2)C0

License

• commercial

Website

• Vendor: https://www.zyxel.com/

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