Is CVE-2024-6143 actively exploited?

No active exploitation of CVE-2024-6143 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2024-6143 be exploited remotely?

Partially. CVE-2024-6143 requires adjacent network access (same network segment) to exploit.

What is the CVSS score of CVE-2024-6143?

CVE-2024-6143 has a CVSS score of 8.8 (HIGH).

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HIGH

CVE-2024-6143

CWE-120Published: June 19, 2024· Updated: Jun 17, 2026

8.8

CVSS v3.1

Official Description

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.

NVD Source

Technical Analysis

CVE-2024-6143 requires adjacent network access, limiting remote exploitation but still posing risk in shared or local network environments.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 8.8.