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CVE-2026-11834

Unauthenticated Command Injection via DHCP Option Handling in Multiple TP-Link Routers

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 1.3.0 Build 250605, 1.5.0 Build 260605, EU_V1_260330, EU_V5_260317, US_V5_260419, and 2 more
1 proof of concept on GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: total

Summary

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.

Timeline

  1. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: total

  2. CVE published
  3. Record last updated

Affected versions

  • TP-Link Systems Inc. Archer MR200 v07

    fixed in 1.3.0 Build 250605

  • TP-Link Systems Inc. Archer MR200 v8

    fixed in 1.5.0 Build 260605

  • TP Link Systems Inc. Archer MR402 v1

    fixed in 1.5.0 Build 260605

  • TP-Link Systems Inc. Archer VR2100 v1

    fixed in EU_V1_260330

  • TP-Link Systems Inc. Archer C20 v5

    fixed in EU_V5_260317; fixed in US_V5_260419

  • TP-Link Systems Inc. Archer C20 v6

    fixed in V6_260608

  • TP-Link Systems Inc. TL-MR6400 v7

    fixed in 1.7.0 Build 260413

References 9

tp-link.com

mattg.systems

GitHub · mattgsys/CVE-2026-11834