CVE-2026-121930 Details
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.
A command injection vulnerability has been identified in the Linksys WRT54GL router, specifically in the Ping Diagnostic feature of the web management interface. This issue arises in firmware version 4.30.18, the last release for a product that is no longer supported. The vulnerability allows authenticated users to inject arbitrary operating system commands through the 'ping_ip' parameter, which is executed with root privileges via the 'apply.cgi' file. The flaw can be exploited remotely, especially if the device's web management is accessible from the WAN.
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
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/Zimo-666/WRT54GL-cves/tree/main/CVE-TBD-ping-ip-command-injection | [email protected] | ExploitTechnical Analysis |
| https://vuldb.com/cve/CVE-2026-121930 | [email protected] | AdvisoryPermission Required |
| https://vuldb.com/submit/1024098 | [email protected] | Issue TrackingPermission Required |
| https://vuldb.com/vuln/431042 | [email protected] | AdvisoryPermission Required |
| https://vuldb.com/vuln/431042/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
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Change History
1 change record found show changes
| Date | Action | Recorded By |
|---|---|---|
| Nov 4, 2026 | New CVE Received | [email protected] |