---
id: CVE-2026-121616
title: Linksys E5600 JSON Request mesh_login.cgi strcpy out-of-bounds write
summary: >-
  A vulnerability was identified in Linksys E5600 1.1.0.26. Affected by this
  vulnerability is the function strcpy of the file /cgi-bin/mesh_login.cgi of
  the component JSON Request Parser. The manipulation of the argument
  username/password/…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:X/RC:C'
cvssSource: cna
cwe:
  - CWE-787
  - CWE-119
vendor: Linksys
product: E5600
affected:
  - E5600 1.1.0.26
published: '2026-11-04'
updated: '2026-11-04'
sourceUpdated: '2026-11-04T02:30:21.965Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-121616'
references:
  - url: 'https://vuldb.com/vuln/430464'
    label: >-
      VDB-430464 | Linksys E5600 JSON Request mesh_login.cgi strcpy
      out-of-bounds write
  - url: 'https://vuldb.com/vuln/430464/cti'
    label: 'VDB-430464 | CTI Indicators (IOB, IOC, IOA)'
  - url: 'https://vuldb.com/cve/CVE-2026-121616'
    label: CVE-2026-121616 | CVE Analysis and Report
  - url: 'https://vuldb.com/submit/1023312'
    label: >-
      Submit #1023312 | Linksys E5600 1.1.0.26 Buffer Overflow - Out-of-bounds
      Write (CWE-787)
  - url: >-
      https://github.com/Zimo-666/E5600-cves/tree/main/03-mesh-login-global-overflow
  - url: 'https://www.linksys.com/'
tags:
  - cve.org
epss: 0.00301
epssPercentile: 0.23016
ingestedAt: '2026-11-05T20:33:06.662Z'
---

## Overview

A vulnerability was identified in Linksys E5600 1.1.0.26. Affected by this vulnerability is the function strcpy of the file /cgi-bin/mesh_login.cgi of the component JSON Request Parser. The manipulation of the argument username/password/token/source/cn/action leads to out-of-bounds write. The attack may be initiated remotely. The exploit is publicly available and might 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.

## Affected

- `E5600 1.1.0.26`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.