CVE-2026-121931

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.

• CWE-77
• CWE-78

• https://github.com/Zimo-666/WRT54GL-cves/tree/main/CVE-TBD-traceroute-ip-command-injection
• https://vuldb.com/cve/CVE-2026-121931
• https://vuldb.com/submit/1024099
• https://vuldb.com/vuln/431043
• https://vuldb.com/vuln/431043/cti
• https://www.linksys.com/

Published

Nov 4, 2026

Last Modified

Nov 4, 2026

Status

Deferred

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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