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CVE-2026-121931Linksys WRT54GL Traceroute Diagnostic Function apply.cgi system os command injection
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.
9.4 CRITICALEPSS 2.72%Not in KEVNVD: Deferred
Overview
Severity
| Score | Severity | Version | Vector String |
|---|---|---|---|
| 9.4 | CRITICAL | 4.0VulDB (CNA) | 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 |
| 8.5 | HIGH | 4.0VulDB (CNA) | 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 |
| 9.1 | CRITICAL | 3.1VulDB (CNA) | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H |
| 9.1 | CRITICAL | 3.1VulDB (CNA) | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H/E:P/RC:C |
| 9.1 | CRITICAL | 3.0VulDB (CNA) | CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H/E:P/RC:C |
| 8.3 | HIGH | 2.0VulDB (CNA) | AV:N/AC:L/Au:M/C:C/I:C/A:C |
| 8.3 | HIGH | 2.0VulDB (CNA) | AV:N/AC:L/Au:M/C:C/I:C/A:C/E:POC/RL:ND/RC:C |
Details
- CVE ID
- CVE-2026-121931
- Status
- Deferred
- Assigner (CNA)
- VulDB
- Published
- Nov 4, 2026
- Last modified
- 2026-11-04 19:17 UTC
Affected Products
As published by the CNA in the CVE record.
LinksysWRT54GL1 version range
- 4.30.18
References
- github.com https://github.com/Zimo-666/WRT54GL-cves/tree/main/CVE-TBD-traceroute-ip-command-injection
- vuldb.com https://vuldb.com/cve/CVE-2026-121931
- vuldb.com https://vuldb.com/submit/1024099
- vuldb.com https://vuldb.com/vuln/431043
- vuldb.com https://vuldb.com/vuln/431043/cti
- linksys.com https://www.linksys.com/