Vulnerability details
CVE-2026-121930
Linksys WRT54GL
Linksys WRT54GL Ping Diagnostic apply.cgi system os command injection
CVSS 4.0
9.4Critical
Official description
A weakness has been identified in Linksys WRT54GL 4.30.18. The affected element is the function system of the file apply.cgi of the component Ping Diagnostic. This manipulation of the argument ping_ip causes os command injection. The attack can be initiated remotely. The exploit has been made available to the public and could be used for attacks. 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:R |
| 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:R |
| 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:UR |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Linksys | WRT54GL | 4.30.18 | CVEProject cvelistV5 (CNA) |
References and advisories
6- https://vuldb.com/vuln/431042 vdb-entrytechnical-description
- https://vuldb.com/vuln/431042/cti signaturepermissions-required
- https://vuldb.com/cve/CVE-2026-121930 third-party-advisory
- https://vuldb.com/submit/1024098 third-party-advisory
- https://github.com/Zimo-666/WRT54GL-cves/tree/main/CVE-TBD-ping-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