---
id: CVE-2025-9791
title: A weakness has been identified in Tenda AC20 16.03.08.05
summary: >-
  A weakness has been identified in Tenda AC20 16.03.08.05. This vulnerability
  affects unknown code of the file /goform/fromAdvSetMacMtuWan. This
  manipulation of the argument wanMTU causes stack-based buffer overflow. Remote
  exploitation o…
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-121
  - CWE-787
vendor: tenda
product: ac20_firmware
affected:
  - ac20_firmware = 16.03.08.5
published: '2025-09-01'
updated: '2026-09-26'
sourceUpdated: '2026-09-26T00:10:00.127'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-9791'
references:
  - url: 'https://github.com/Cpppq43/Tenda/blob/main/Tenda_AC20_V16.03.08.05.md'
    label: cna@vuldb.com
  - url: 'https://github.com/Cpppq43/Tenda/blob/main/Tenda_AC20_V16.03.08.05.md#poc'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/?ctiid.322106'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/?id.322106'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/?submit.641088'
    label: cna@vuldb.com
  - url: 'https://www.tenda.com.cn/'
    label: cna@vuldb.com
  - url: 'https://github.com/Cpppq43/Tenda/blob/main/Tenda_AC20_V16.03.08.05.md'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://github.com/Cpppq43/Tenda/blob/main/Tenda_AC20_V16.03.08.05.md#poc'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
epss: 0.00855
epssPercentile: 0.56614
ingestedAt: '2026-09-26T00:22:39.906Z'
---

## Overview

A weakness has been identified in Tenda AC20 16.03.08.05. This vulnerability affects unknown code of the file /goform/fromAdvSetMacMtuWan. This manipulation of the argument wanMTU causes stack-based buffer overflow. Remote exploitation of the attack is possible. The exploit has been made available to the public and could be exploited.

## Affected

- `ac20_firmware = 16.03.08.5`

## Remediation

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