CVE-2026-121930

CRITICAL 9.1

Linksys WRT54GL Ping Diagnostic apply.cgi system os command injection

CVSS Score

9.1

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-78 CWE-77
Vendor	linksys
Product	wrt54gl
Published	Nov 4, 2026

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CVSS v3 Breakdown

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

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

Integrity

Availability

Affected Versions

Linksys / WRT54GL

4.30.18

References

NVD ↗ CVE.org ↗ EPSS Data ↗

vuldb.com: https://vuldb.com/vuln/431042 vuldb.com: https://vuldb.com/vuln/431042/cti vuldb.com: https://vuldb.com/cve/CVE-2026-121930 vuldb.com: https://vuldb.com/submit/1024098 github.com: https://github.com/Zimo-666/WRT54GL-cves/tree/main/CVE-TBD-ping-ip-command-injection linksys.com: https://www.linksys.com/

Credits

🔍 liuyingqi (VulDB User) VulDB CNA Team