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Critical Stack Buffer Overflow in TP-Link TL-WR940N Enables Remote Code Execution

A high-severity vulnerability tracked as CVE-2026-12935 with a CVSS score of 8.7 affects the TP-Link TL-WR940N router on hardware version V6. The flaw resides in the RTSP connection tracking module responsible for managing audio and video streaming sessions over the network. It is caused by a stack-based buffer overflow that allows oversized data to corrupt kernel memory, potentially leading to device crashes or full remote code execution. No administrative credentials are required for exploitation, though the attack depends on an RTSP connection initiated by a device already present on the local network. Successful compromise grants attackers the ability to alter router settings, modify DNS servers, intercept traffic, redirect users to malicious sites, and pivot to other connected devices. Users are advised to verify the hardware revision on the device label and apply the region-specific firmware update released by TP-Link.

BoletimSecTranslated from Portuguese

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A high-severity vulnerability in the TP-Link TL-WR940N router can allow attackers to execute arbitrary code remotely and take full control of the device.

The flaw, registered as CVE-2026-12935 and assigned a CVSS score of 8.7, affects only hardware version V6 of the model. It is located in the RTSP connection tracking module, which handles control sessions for audio and video streaming across the network.

The root cause is a stack-based buffer overflow. When data exceeding the allocated buffer size is processed, it can corrupt kernel memory, the core component managing router operations. This can result in system crashes or allow an attacker to run commands of their choosing.

The attack does not require a password or administrative access. However, it depends on an RTSP connection initiated by a device already connected to the same network. Once the router is compromised, attackers can change configuration settings, modify DNS servers, intercept communications, redirect users to fraudulent websites, or use the device to target other connected equipment.

Users should check the hardware version printed on the router label and install only the firmware update that matches their specific region.

TP-Link TL-WR940NCVE-2026-12935RTSP
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