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CVE-2026-11834 TP-Link Systems Inc. CVE debrief

CVE-2026-11834 is a high-severity command injection vulnerability in multiple TP-Link router models. 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 vulnerability has a CVSS score of 8.7 and is classified as HIGH severity.

Vendor
TP-Link Systems Inc.
Product
Archer MR200 v07
CVSS
HIGH 8.7
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-22
Original CVE updated
2026-06-26
Advisory published
2026-06-22
Advisory updated
2026-06-26

Who should care

Administrators and users of TP-Link router models affected by this vulnerability should be aware of the potential risks and take necessary precautions to prevent exploitation. This vulnerability can be particularly concerning for organizations that use these routers in their network infrastructure. It is essential to review the affected products and upgrade to a patched version as soon as possible.

Technical summary

The vulnerability is caused by insufficient validation of externally supplied DHCP option data in the DHCP option processing logic of multiple TP-Link router models. An adjacent attacker can exploit this vulnerability by supplying crafted DHCP responses, which can lead to unauthorized command execution during device initialization or provisioning workflows. The vulnerability has a CVSS score of 8.7 and is classified as HIGH severity. The affected products include various TP-Link router models, such as Archer C20, Archer MR200, Archer MR402, Archer VR2100, and TL-MR6400.

Defensive priority

This vulnerability has a high CVSS score of 8.7 and is classified as HIGH severity. It is essential to prioritize patching or mitigating this vulnerability to prevent potential exploitation.

Recommended defensive actions

  • Review the affected TP-Link router models and upgrade to a patched version as soon as possible.
  • Implement network segmentation to limit the attack surface.
  • Monitor network traffic for suspicious DHCP responses.
  • Consider implementing compensating controls, such as firewall rules or intrusion detection systems.
  • Keep device firmware and software up-to-date.

Evidence notes

The CVE record and NVD detail provide information on the vulnerability, its severity, and the affected products. The source item URL provides additional information on the vulnerability and its exploitation. However, the vendor and product information is limited, and further research is needed to determine the exact affected products and versions.

Official resources

This article is AI-assisted and based on the supplied source corpus.