---
id: CVE-2026-121600
title: TOTOLINK A950RG MAC Filter cstecgi.cgi setMacFilterRules stack-based overflow
summary: >-
  A flaw has been found in TOTOLINK A950RG 4.1.2cu.5268_B20221104. Affected by
  this vulnerability is the function setMacFilterRules of the file
  /cgi-bin/cstecgi.cgi of the component MAC Filter Handler. This manipulation of
  the argument add…
severity: critical
cvss: 9.9
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:P/RL:X/RC:R'
cvssSource: cna
cwe:
  - CWE-121
  - CWE-119
vendor: TOTOLINK
product: A950RG
affected:
  - A950RG 4.1.2cu.5268_B20221104
published: '2026-11-04'
updated: '2026-11-04'
sourceUpdated: '2026-11-04T00:45:35.387Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-121600'
references:
  - url: 'https://vuldb.com/vuln/430442'
    label: >-
      VDB-430442 | TOTOLINK A950RG MAC Filter cstecgi.cgi setMacFilterRules
      stack-based overflow
  - url: 'https://vuldb.com/vuln/430442/cti'
    label: 'VDB-430442 | CTI Indicators (IOB, IOC, IOA)'
  - url: 'https://vuldb.com/cve/CVE-2026-121600'
    label: CVE-2026-121600 | CVE Analysis and Report
  - url: 'https://vuldb.com/submit/1022562'
    label: >-
      Submit #1022562 | TOTOLINK A950RG V4.1.2cu.5268_B20221104 Stack Buffer
      Overflow
  - url: 'https://gist.github.com/H3rmesk1t/217c00b12e04fcde07c453a55579f808'
  - url: 'https://www.totolink.net/'
tags:
  - cve.org
epss: 0.00466
epssPercentile: 0.40489
ingestedAt: '2026-11-05T20:33:06.655Z'
---

## Overview

A flaw has been found in TOTOLINK A950RG 4.1.2cu.5268_B20221104. Affected by this vulnerability is the function setMacFilterRules of the file /cgi-bin/cstecgi.cgi of the component MAC Filter Handler. This manipulation of the argument addEffect causes stack-based buffer overflow. The attack can be initiated remotely. The exploit has been published and may be used.

## Affected

- `A950RG 4.1.2cu.5268_B20221104`

## Remediation

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