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CVE-2026-121615

10, critical

Linksys E5600 Improper Authentication Vulnerability

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

Description

A vulnerability was determined in Linksys E5600 1.1.0.26. Affected is an unknown function of the file /cgi-bin/mesh_login.cgi of the component Login Handler. Executing a manipulation can lead to improper authentication. The attack can be launched remotely. The exploit has been publicly disclosed and may be utilized. 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
E5600
Weakness
CWE-287 (opens in a new tab)
Status
Deferred
Updated
4 Nov 2026
Assigner
cna@vuldb.com

CVSS:3.1/AV:N/AC:L/PR:N/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-2026-121617 Linksys E5600 Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability 7.5, high
  • 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
  • CVE-2026-108893 Linksys E1700 Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability EPSS 0.5% 9.9, critical
  • CVE-2026-108894 Linksys E1700 Command Injection Vulnerability EPSS 2% 9.9, critical
  • CVE-2026-108895 Linksys E1700 Command Injection Vulnerability EPSS 2% 9.9, critical
  • CVE-2026-108896 Linksys E1700 Command Injection Vulnerability EPSS 2% 9.9, critical

Beyond this page

Is CVE-2026-121615 in your network?

This page tells you how dangerous CVE-2026-121615 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-2026-121615 comes with the devices to patch.

    Learn more about EXYS7600 OCELOT

  • 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 4 Nov 2026, not the live upstream state.