---
id: CVE-2026-82539
title: A vulnerability was determined in TOTOLINK A720R 4.1.5cu.630_B20250509
summary: >-
  A vulnerability was determined in TOTOLINK A720R 4.1.5cu.630_B20250509. This
  impacts the function setMacFilterRules of the file cstecgi.cgi of the
  component MAC Filtering. Executing a manipulation of the argument desc can
  lead to memory …
severity: critical
cvss: 9.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H'
cwe:
  - CWE-119
published: '2026-08-30'
updated: '2026-08-30'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-82539'
references:
  - url: 'https://github.com/Xernary/CVE-2026-82539'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/cve/CVE-2026-82539'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/submit/888696'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/vuln/397055'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/vuln/397055/cti'
    label: cna@vuldb.com
  - url: 'https://www.totolink.net/'
    label: cna@vuldb.com
tags:
  - nvd
  - exploit-available
ingestedAt: '2026-08-30T17:55:39.746Z'
epss: 0.00599
epssPercentile: 0.47084
exploits:
  github: 1
  githubRepos:
    - 'https://github.com/Xernary/CVE-2026-82539'
  checkedAt: '2026-09-21T15:30:52.929Z'
exploitAvailable: true
---

## Overview

A vulnerability was determined in TOTOLINK A720R 4.1.5cu.630_B20250509. This impacts the function setMacFilterRules of the file cstecgi.cgi of the component MAC Filtering. Executing a manipulation of the argument desc can lead to memory corruption. The attack may be launched remotely. The exploit has been publicly disclosed and may be utilized.

## Remediation

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