TP-Link TL-MR6400 v7 DHCP os command injection

Summaryinfo

A vulnerability classified as critical has been found in TP-Link Archer MR200 v07, Archer MR200 v8, Archer MR402 v1, Archer VR2100 v1, Archer C20 v5, Archer C20 v6 and TL-MR6400 v7. This impacts an unknown function of the component DHCP Handler. Performing a manipulation results in os command injection. This vulnerability is reported as CVE-2026-11834. The attacker must have access to the local network to execute the attack. No exploit exists.

Detailsinfo

A vulnerability was found in TP-Link Archer MR200 v07, Archer MR200 v8, Archer MR402 v1, Archer VR2100 v1, Archer C20 v5, Archer C20 v6 and TL-MR6400 v7. It has been classified as critical. This affects some unknown processing of the component DHCP Handler. The manipulation with an unknown input leads to a os command injection vulnerability. CWE is classifying the issue as CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

The weakness was disclosed by Matt Graham. The advisory is shared at tp-link.com. This vulnerability is uniquely identified as CVE-2026-11834 since 06/10/2026. The exploitability is told to be easy. Access to the local network is required for this attack to succeed. No form of authentication is needed for exploitation. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 06/22/2026). MITRE ATT&CK project uses the attack technique T1202 for this issue.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-38339). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Router Operating System

Vendor

• TP-Link

Name

• Archer C20 v5
• Archer C20 v6
• Archer MR200 v07
• Archer MR200 v8
• Archer MR402 v1
• Archer VR2100 v1
• TL-MR6400 v7

License

• commercial

Website

• Vendor: https://www.tp-link.com/

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Discussion