OS Command Injection in Linksys Wireless Router
CVE-2026-121930

9.4CRITICAL

Key Information:

Vendor

Linksys
Status
Wrt54gl
Vendor
CVE Published:
4 November 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-121930?

A vulnerability has been discovered in the Linksys WRT54GL router version 4.30.18, where improper handling of the ping_ip argument in the apply.cgi function of the Ping Diagnostic component can lead to OS command injection. This flaw can be exploited remotely, allowing attackers to execute arbitrary commands on the device. As this product is no longer supported by Linksys, the risk of exploitation increases significantly, making it crucial for users to be aware of the potential security implications.

Affected Version(s)

WRT54GL 4.30.18

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-121930 - Proof of Concept

References

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

CVSS V4

Score:
9.4
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

liuyingqi (VulDB User)
VulDB CNA Team
.