Vulnerability 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.
Related Weaknesses (CWE)
References
- https://mattg.systems/posts/cve-2026-11834/
- https://www.tp-link.com/en/support/download/archer-c20/
- https://www.tp-link.com/en/support/download/archer-mr200/#Firmware
- https://www.tp-link.com/en/support/download/archer-mr402/#Firmware
- https://www.tp-link.com/en/support/download/archer-vr2100/#Firmware
- https://www.tp-link.com/en/support/download/tl-mr6400/v7/#Firmware
- https://www.tp-link.com/us/support/download/archer-c20/
- https://www.tp-link.com/us/support/faq/5141/
FAQ
What is CVE-2026-11834?
CVE-2026-11834 is a documented vulnerability. 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 ...
How severe is CVE-2026-11834?
CVSS scoring is not yet available for CVE-2026-11834. Check NVD for updates.
Is there a patch for CVE-2026-11834?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.