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CVE-2026-121930

9.1, critical

Linksys WRT54GL Command Injection Vulnerability

NVD (opens in a new tab) CVE.org (opens in a new tab)
CVSS
9.1, critical critical CVSS v3.1
EPSS, next 30 days
n/a
Exploitation
No public evidence
Published
4 Nov 2026yesterday

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.

Details

Vendor
Linksys
Product
WRT54GL
Weakness
CWE-77 (opens in a new tab)
Status
Deferred
Updated
4 Nov 2026
Assigner
cna@vuldb.com

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

References 6

Other references 6

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other Linksys CVEs

Every Linksys CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2026-121615 Linksys E5600 Improper Authentication Vulnerability EPSS 0.8% 10, critical
  • CVE-2026-121617 Linksys E5600 Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability EPSS 0.5% 7.5, high
  • CVE-2026-121931 Linksys WRT54GL Command Injection Vulnerability 9.1, critical
  • CVE-2026-121932 Linksys E5350 Command Injection Vulnerability 10, critical
  • CVE-2026-121933 Linksys E5350 Improper Authentication Vulnerability 10, critical
  • CVE-2026-120283 Linksys E8450 Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability EPSS 0.6% 10, critical
  • CVE-2013-20007 Linksys WAG200G OS Command Injection Vulnerability EPSS 2% 7.2, high
  • CVE-2026-108892 Linksys E1700 Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability EPSS 0.6% 10, critical

Beyond this page

Is CVE-2026-121930 in your network?

This page tells you how dangerous CVE-2026-121930 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

  • EXYS7600 OCELOT

    Find it before attackers do

    Ocelot scans your network on a schedule and reports every vulnerability it finds by its CVE identifier, with its CVSS score and how many of your hosts are affected. A finding like CVE-2026-121930 comes with the devices to patch.

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  • EXYS7950 KONDRA

    Detect it if it's exploited

    Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.

    Learn more about EXYS7950 KONDRA
Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 5 Nov 2026, not the live upstream state.