Paper/Archive/CVE-2026-121931

CVE-2026-121931

Linksys WRT54GL — Linksys WRT54GL Traceroute Diagnostic Function apply.cgi system os command injection

CVSS 9.4 (CNA)9.4 / 10 × 3028.2 Not in CISA KEV+300.0 No EPSS score.000 × 200.0 No public exploit+100.0 SSVC exploitation: unknown+100.0

Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource

WRT54GL4.30.18–CNA

Scores by source

VulDB (CNA)9.4CVSS: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

VulDB (CNA)9.1CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H/E:P/RL:X/RC:C

VulDB (CNA)9.1CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H/E:P/RL:X/RC:C

References

writeupvuldb.com/vuln/431043 refvuldb.com/vuln/431043/cti writeupvuldb.com/cve/CVE-2026-121931 writeupvuldb.com/submit/1024099 exploitgithub.com/Zimo-666/WRT54GL-cves/tree/main/CVE-TBD-traceroute-ip-command-injection reflinksys.com