---
id: CVE-2026-121597
title: >-
  TOTOLINK A950RG Easy Setup Wizard cstecgi.cgi setAppEasyWizardConfig
  stack-based overflow
summary: >-
  A weakness has been identified in TOTOLINK A950RG 4.1.2cu.5268_B20221104. This
  affects the function setAppEasyWizardConfig of the file /cgi-bin/cstecgi.cgi
  of the component Easy Setup Wizard Handler. Executing a manipulation of the
  argum…
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: '2026-11-04T00:00:30.063Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-121597'
references:
  - url: 'https://vuldb.com/vuln/430439'
    label: >-
      VDB-430439 | TOTOLINK A950RG Easy Setup Wizard cstecgi.cgi
      setAppEasyWizardConfig stack-based overflow
  - url: 'https://vuldb.com/vuln/430439/cti'
    label: 'VDB-430439 | CTI Indicators (IOB, IOC, IOA)'
  - url: 'https://vuldb.com/cve/CVE-2026-121597'
    label: CVE-2026-121597 | CVE Analysis and Report
  - url: 'https://vuldb.com/submit/1022558'
    label: >-
      Submit #1022558 | TOTOLINK A950RG V4.1.2cu.5268_B20221104 Stack Buffer
      Overflow
  - url: 'https://gist.github.com/H3rmesk1t/49d6ccded59379651568e0bdc6b5624c'
  - url: 'https://www.totolink.net/'
tags:
  - cve.org
epss: 0.00601
epssPercentile: 0.48891
ingestedAt: '2026-11-05T20:33:06.639Z'
---

## Overview

A weakness has been identified in TOTOLINK A950RG 4.1.2cu.5268_B20221104. This affects the function setAppEasyWizardConfig of the file /cgi-bin/cstecgi.cgi of the component Easy Setup Wizard Handler. Executing a manipulation of the argument functionType can lead to stack-based buffer overflow. The attack may be performed from remote. The exploit has been made available to the public and could be used for attacks.

## Affected

- `A950RG 4.1.2cu.5268_B20221104`

## Remediation

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