Vulnerability details
CVE-2026-121931
Linksys WRT54GL
Linksys WRT54GL Traceroute Diagnostic Function apply.cgi system os command injection
CVSS 4.0
9.4Critical
Official 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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 9.4Critical | 4.0 | CVEProject cvelistV5 (CNA) (VulDB) | 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 |
| 9.1Critical | 3.1 | CVEProject cvelistV5 (CNA) (VulDB) | 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 |
| 9.1Critical | 3.0 | CVEProject cvelistV5 (CNA) (VulDB) | CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H/E:P/RL:X/RC:C |
| 8.3High | 2.0 | CVEProject cvelistV5 (CNA) (VulDB) | AV:N/AC:L/Au:M/C:C/I:C/A:C/E:POC/RL:ND/RC:C |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Linksys | WRT54GL | 4.30.18 | CVEProject cvelistV5 (CNA) |
References and advisories
6- https://vuldb.com/vuln/431043 vdb-entrytechnical-description
- https://vuldb.com/vuln/431043/cti signaturepermissions-required
- https://vuldb.com/cve/CVE-2026-121931 third-party-advisory
- https://vuldb.com/submit/1024099 third-party-advisory
- https://github.com/Zimo-666/WRT54GL-cves/tree/main/CVE-TBD-traceroute-ip-command-injection exploit
- https://www.linksys.com/ product
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Details
- Published
- 2026-11-04
- Last updated
- 2026-11-09
- State
- Published
- Assigner (CNA)
- VulDB
- Kolun priority
- 46 · Medium
Exploit prediction (EPSS)
2.72%
Probability of exploitation in 30 days
86.1%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- Proof of concept
- Technical impact
- Total
Weaknesses (CWE)
- CWE-78OS Command Injection
- CWE-77Command Injection