CVE-2024-6143: Actiontec WCB6200Q Firmware

High severity, CVSS 8.8. EPSS: 1.1% chance of exploitation in the next 30 days.

Actiontec WCB6200Q uh_tcp_recv_header Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of Actiontec WCB6200Q routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the HTTP server. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length buffer. An attacker can leverage this vulnerability to execute code in the context of the HTTP server. Was ZDI-CAN-21414.

Affected products

• Actiontec WCB6200Q Firmware: version 1.2l.03.5 only

Published 2024-06-19. Last modified 2026-06-17.