Critical 9.1

A security vulnerability has been detected in Linksys WRT54GL 4.30.18. The impacted element is...

CVE-2026-121931 First seen on SecPulse Nov 5, 03:45

Original description The description as published by the source.

A security vulnerability has been detected in Linksys WRT54GL 4.30.18. The impacted element is the function system of the file apply.cgi of the component Traceroute Diagnostic Function. Such manipulation of the argument traceroute_ip leads to os command injection. The attack can be launched remotely. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure but did not respond in any way. This vulnerability only affects products that are no longer supported by the maintainer.

Source: CVE.org (CVE Program・cvelistV5) NVD GitHub Advisory

References

Key facts

CVSS v3: Critical 9.1; CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
CVSS v4: High 8.5; CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P
Published: Nov 5, 2026
First seen on SecPulse: Nov 5, 03:45
GHSA: GHSA-7p5v-44wr-v953
CWE: CWE-77

NVD GitHub Advisory

Tags(click for explanation)

CWE

CWE-78 CWE-77

All

Linksys Wrt54Gl

Detection sources

NIST National Vulnerability DatabaseNov 5, 04:17
GitHub Security Advisories (Global)Nov 5, 06:32
CVE.org (CVE Program・cvelistV5)Nov 5, 03:45