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    CVE-2026-121931

    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.

    Published:Nov 4, 2026
    Last Modified:Nov 4, 2026
    EPS:Nov 4, 2026
    EPSS Score:
    CVSS Score:9.1

    Affected Products

    Vendor
    Linksys
    Product
    Wrt54gl

    Exploits

    No exploit reference

    Related CVEs

    CVE-2026-121930 (CVSS 8.5) — A weakness has been identified in Linksys WRT54GL 4.30.18. The affected element is the function system of the …
    CVE-2024-1406 (CVSS 4.3) — A vulnerability was found in Linksys WRT54GL 4.30.18. It has been declared as problematic. This vulnerability …
    CVE-2024-1405 (CVSS 4.3) — A vulnerability was found in Linksys WRT54GL 4.30.18. It has been classified as problematic. This affects an u…
    CVE-2024-1404 (CVSS 4.3) — A vulnerability was found in Linksys WRT54GL 4.30.18 and classified as problematic. Affected by this issue is …
    CVE-2023-31742 (CVSS 7.2) — There is a command injection vulnerability in the Linksys WRT54GL router with firmware version 4.30.18.006. If…
    CVE-2022-43972 (CVSS 6.5) — A null pointer dereference vulnerability exists in Linksys WRT54GL Wireless-G Broadband Router with firmware <…
    CVE-2022-43970 (CVSS 7.2) — A buffer overflow vulnerability exists in Linksys WRT54GL Wireless-G Broadband Router with firmware <= 4.30.18…
    CVE-2022-43973 (CVSS 7.2) — An arbitrary code execution vulnerability exisits in Linksys WRT54GL Wireless-G Broadband Router with firmware…
    CVE-2009-3341 (CVSS 10) — Buffer overflow on the Linksys WRT54GL wireless router allows remote attackers to execute arbitrary code via u…
    CVE-2008-0228 (CVSS 9.3) — Cross-site request forgery (CSRF) vulnerability in apply.cgi in the Linksys WRT54GL Wireless-G Broadband Route…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-121931 — Linksys (High 8.5) | CVE-DB