---
id: CVE-2021-42232
title: >-
  TP-Link Archer A7 Archer A7(US)_V5_210519 is affected by a command injection
  vulnerability in /usr/bin/tddp
summary: >-
  TP-Link Archer A7 Archer A7(US)_V5_210519 is affected by a command injection
  vulnerability in /usr/bin/tddp. The vulnerability is caused by the program
  taking part of the received data packet as part of the command. This will
  cause an at…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-78
vendor: tp-link
product: archer_a7_firmware
affected:
  - archer_a7_firmware = 210519
published: '2022-08-23'
updated: '2026-07-05'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2021-42232'
references:
  - url: >-
      https://github.com/mQaLeX/IoT/blob/main/tp-link/Archer%20A7%28US%29_V5_20519_tddp.md
    label: cve@mitre.org
  - url: 'http://archer.com'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://tp-link.com'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://github.com/mQaLeX/IoT/blob/main/tp-link/Archer%20A7%28US%29_V5_20519_tddp.md
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.04256
epssPercentile: 0.90642
ingestedAt: '2026-07-06T17:03:24.892Z'
---

## Overview

TP-Link Archer A7 Archer A7(US)_V5_210519 is affected by a command injection vulnerability in /usr/bin/tddp. The vulnerability is caused by the program taking part of the received data packet as part of the command. This will cause an attacker to execute arbitrary commands on the router.

## Affected

- `archer_a7_firmware = 210519`

## Remediation

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