CVE-2026-121931 Details
Description
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.
An authenticated OS command injection vulnerability has been identified in the Linksys WRT54GL router, specifically in the Traceroute diagnostic function of the web management interface. This issue arises in firmware version 4.30.18, the final release for this end-of-life product. The vulnerability allows authenticated attackers to inject arbitrary commands through the `traceroute_ip` parameter, which is executed as root via the `system()` function. The exploitation can be performed remotely, especially if the device's WAN link is active and remote management is enabled.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Nov 4, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/Zimo-666/WRT54GL-cves/tree/main/CVE-TBD-traceroute-ip-command-injection | [email protected] | ExploitTechnical Analysis |
| https://vuldb.com/cve/CVE-2026-121931 | [email protected] | AdvisoryPermission Required |
| https://vuldb.com/submit/1024099 | [email protected] | Permission Required |
| https://vuldb.com/vuln/431043 | [email protected] | Permission Required |
| https://vuldb.com/vuln/431043/cti | [email protected] | Content Wall |
| https://www.linksys.com/ | [email protected] | Vendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-77 | Improper Neutralization of Special Elements used in a Command ('Command Injection') | [email protected] |
| CWE-78 | Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Linksys WRT54GL | 4.30.18 (semver) |
CPE
Remediation
| |
Change History
1 change record found show changes
| Date | Action | Recorded By |
|---|---|---|
| Nov 4, 2026 | New CVE Received | [email protected] |