A high-severity buffer overflow vulnerability in the TP-Link TL-MR6400 v7.0 firmware update process could allow an authenticated administrator to execute arbitrary code.

The device suffers from a stack-based buffer overflow (CWE-121) during firmware updates. This flaw requires the attacker to hold administrative privileges to trigger the vulnerable update functionality.

The CVSS score of 8.5 underscores the severity of this issue, as it allows for full system compromise of the network device. Unauthorized control over the router could lead to traffic interception, man-in-the-middle attacks, or complete loss of network availability for connected clients.

Immediate Action: Update the firmware of your TL-MR6400 v7.0 device to version 1.9.0 Build 260714 or later via the official TP-Link support portal.

Proactive Monitoring: Review device access logs to identify any unauthorized or unexpected firmware update attempts.

Compensating Controls: Restrict administrative access to the router to a dedicated, secure management network, and ensure the web interface is not exposed to the public internet.

Public Exploit Available: No

Firmware-level vulnerabilities are critical as they bypass traditional host-based security. Administrators should verify their current build version and apply the manufacturer-provided update immediately to secure the device from potential exploitation.