CVE-2026-121931: critical vulnerability in Linksys WRT54GL
Linksys WRT54GL Traceroute Diagnostic Function apply.cgi system os command injection
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
48Vexday Risk Score
No sign of exploitation. It has a public proof of concept.
ssvc Attendcvss 9.4epss 2.7%
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.
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
Affected products
Linksys · WRT54GLpublic PoCs found — 1
cve_referencegithub.com/Zimo-666/WRT54GL-cves/tree/main/CVE-TBD-traceroute-ip-command-injectionunverified⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
Related CVEs — Linksys WRT54GL
In the same product, most dangerous first.
CVE-2026-121930CRITICALLinksys WRT54GL Ping Diagnostic apply.cgi system os command injectionEPSS 2.7%CVE-2024-1404MEDIUMLinksys WRT54GL Web Management Interface SysInfo.htm information disclosureEPSS 0.8%CVE-2024-1406MEDIUMLinksys WRT54GL Web Management Interface SysInfo1.htm information disclosureEPSS 0.5%CVE-2024-1405MEDIUMLinksys WRT54GL Web Management Interface wlaninfo.htm information disclosureEPSS 0.4%