CVE-2026-12935: Unauthenticated Remote Code Execution in TP-Link TL-WR940N RTSP Conntrack Feature

Severity: high (CVSS 8.7 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-29 · updated 2026-10-24
Weakness: CWE-121

Description

The TL-WR940N v6 router contains a vulnerability in its RTSP connection tracking module that can lead to a stack-based buffer overflow. The issue occurs when a LAN client initiates a connection to a malicious RTSP server controlled by an attacker. A specially crafted RTSP message may trigger improper memory handling within the kernel module Successful exploitation of this vulnerability may result in a denial-of-service (DoS) condition or allow remote code execution (RCE), potentially leading to full compromise of the device. This vulnerability can be exploited by an unauthenticated attacker under the device's default configuration.

Affected products

TP-Link TL-WR940N: before (US)_V6_260528; before (JP)_V6_260527; before (EU)_V6_260528 — fixed in (EU)_V6_260528, (JP)_V6_260527, (US)_V6_260528

How to fix

Upgrade to a fixed version: TP-Link TL-WR940N (EU)_V6_260528, (JP)_V6_260527, (US)_V6_260528. Check the vendor advisory for mitigations.

References

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