PT-2026-51371 · Tp Link Systems · Archer C20 V5+6

Matt Graham · Published 2026-06-22 · Updated 2026-06-22 · CVE-2026-11834

NVD

CVSS v4.0

8.7

High

Base vector

AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

A command injection vulnerability has been identified in the DHCP option processing logic in multiple TP-Link router models, due to insufficient validation of externally supplied DHCP option data. An adjacent attacker may exploit this vulnerability by supplying crafted DHCP responses, potentially resulting in unauthorized command execution during device initialization or provisioning workflows. This typically occurs when the device is in a factory-default or unconfigured state.

Successful exploitation may allow an adjacent, unauthenticated attacker to execute arbitrary commands with elevated privileges, potentially leading to full compromise of the affected device and unauthorized administrative control.

Fix

OS Command Injection

Weakness Enumeration

CWE-78

Related Identifiers

CVE-2026-11834

Affected Products

Archer C20 V5

Archer C20 V6

Archer Mr200 V07

Archer Mr200 V8

Archer Mr402 V1

Archer Vr2100 V1

Tl-Mr6400 V7

References · 8

• https://tp-link.com/en/support/download/archer-vr2100/#Firmware · Patch
• https://tp-link.com/en/support/download/archer-mr402/#Firmware · Patch
• https://tp-link.com/us/support/download/archer-c20 · Patch
• https://tp-link.com/en/support/download/tl-mr6400/v7/#Firmware · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-11834 · Security Note
• https://tp-link.com/us/support/faq/5141 · Vendor Advisory
• https://tp-link.com/en/support/download/archer-c20 · Patch
• https://tp-link.com/en/support/download/archer-mr200/#Firmware · Patch