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  4. CVE 2026 121930 linksys wrt54gl ping diagnostic applycgi system
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Back to active CVEs
Critical · CVSS 9.4CVE-2026-121930

Linksys WRT54GL Ping Diagnostic apply.cgi system os command injectionCVE-2026-121930

Answer in brief

CVE-2026-121930 records a Critical severity (CVSS 9.4) vulnerability in Linksys WRT54GL Ping Diagnostic apply.cgi system os command injection. The current sources do not mark it as known exploited. The current feed maps Linksys/WRT54GL (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Nov 4, 2026Updated Nov 4, 2026Source checked Nov 4, 2026First seen by HOL Nov 4, 2026Material review Nov 4, 2026
Upstream Advisory

Key facts

Risk
Critical · CVSS 9.4
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Not reported

Why this deserves its current priority

CVSS is 9.4. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linksys/WRT54GL (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Linksys/WRT54GLgeneric4.30.18Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Linksys/WRT54GL.
  2. 2Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

  1. Published upstream

    Nov 4, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 4, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 4, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • Source referencevuldb.com
  • Source referencevuldb.com
  • Source referencevuldb.com
  • Source referencevuldb.com
  • Source referencelinksys.com
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Linksys WRT54GL Traceroute Diagnostic Function apply.cgi system os command injectionSame linksys/wrt54gl package
  • Linksys E5350 apply.cgi system os command injectionAlso CWE-78

Record context

Vulnerability class
Command Injection
EPSS
Not reported
CWE IDs
CWE-78, CWE-77
Source
CVE List V5
Source checked
Nov 4, 2026
References
6 linked sources
Open source record