CVE-2026-121931

CRITICAL 9.1

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

CVSS Score

9.1

EPSS Score

0.0%

EPSS Percentile

0th

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	CWE-78 CWE-77
Vendor	linksys
Product	wrt54gl
Published	Nov 4, 2026

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CVSS v3 Breakdown

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

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

Integrity

Availability

Affected Versions

Linksys / WRT54GL

4.30.18

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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

Credits

🔍 liuyingqi (VulDB User) VulDB CNA Team