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Vulnerability · Published Jun 22, 2026 · Assigned by TPLink

CVE-2026-11834Unauthenticated Command Injection via DHCP Option Handling in Multiple TP-Link Routers

High 8.7

In plain English

A high-severity OS command injection in Archer C20 v5 from TP-Link Systems Inc.. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 52% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code.

Severity (CVSS 4.0)8.7High
Exploit odds (30 days)0.7%top 48.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack tooling1Public PoC

Official description

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.

Affected products (as reported)

VendorProductVersions
TP-Link Systems Inc. Archer MR200 v07 0 – before 1.3.0 Build 250605
TP-Link Systems Inc. Archer MR200 v8 0 – before 1.5.0 Build 260605
TP Link Systems Inc. Archer MR402 v1 0 – before 1.5.0 Build 260605
TP-Link Systems Inc. Archer VR2100 v1 0 – before EU_V1_260330
TP-Link Systems Inc. Archer C20 v5 0 – before EU_V5_2603170 – before US_V5_260419
TP-Link Systems Inc. Archer C20 v6 0 – before V6_260608
TP-Link Systems Inc. TL-MR6400 v7 0 – before 1.7.0 Build 260413

Weakness: CWE-78 · Vector: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

References