Zyxel fixes 1 vulnerability

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[TLP:CLEAR] Zyxel fixes 1 vulnerability

Zyxel fixes a high-severity vulnerability in the firmware of DSL/Ethernet CPE, Fiber ONTs and Wireless Extenders devices. The fixed versions of the individual products can be found in a clear table at [1].

Zyxel DSL/Ethernet CPE, Fiber ONTs and Wireless Extenders - OS command execution (CVE-2026-6952)

CVSS 7.2 (High)

An authenticated remote attacker with administrator rights can execute commands at the operating system level of the device due to improper handling of the "LogServer" field in the syslog component. WAN access is disabled by default on the affected devices [1][2].

CVSS: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

More information:

CVE-2026-6952 at cve.org, NVD
CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') at cwe.mitre.org

The vulnerability was publicly disclosed 21. 7. 2026.

Links

By CESNET, z.s.p.o. Michaela Ručková on 22. 7. 2026.

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[TLP:CLEAR] Zyxel fixes 1 vulnerability

Zyxel DSL/Ethernet CPE, Fiber ONTs and Wireless Extenders - OS command execution (CVE-2026-6952)

CVSS 7.2 (High)

Links