---
id: CVE-2025-11091
title: A security flaw has been discovered in Tenda AC21 up to 16.03.08.16
summary: >-
  A security flaw has been discovered in Tenda AC21 up to 16.03.08.16. Affected
  by this vulnerability is the function sscanf of the file
  /goform/SetStaticRouteCfg. The manipulation of the argument list results in
  buffer overflow. The attac…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-119
  - CWE-120
vendor: tenda
product: ac21_firmware
affected:
  - ac21_firmware <= 16.03.08.16
published: '2025-09-28'
updated: '2026-10-09'
sourceUpdated: '2026-10-09T10:10:00.193'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-11091'
references:
  - url: 'https://github.com/maximdevere/CVE2/issues/2'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/?ctiid.326173'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/?id.326173'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/?submit.661806'
    label: cna@vuldb.com
  - url: 'https://www.tenda.com.cn/'
    label: cna@vuldb.com
  - url: 'https://github.com/maximdevere/CVE2/issues/2'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
epss: 0.00736
epssPercentile: 0.53069
ingestedAt: '2026-10-09T12:53:28.516Z'
---

## Overview

A security flaw has been discovered in Tenda AC21 up to 16.03.08.16. Affected by this vulnerability is the function sscanf of the file /goform/SetStaticRouteCfg. The manipulation of the argument list results in buffer overflow. The attack can be launched remotely. The exploit has been released to the public and may be exploited.

## Affected

- `ac21_firmware <= 16.03.08.16`

## Remediation

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