CVE-2026-12935

Received Received - Intake

Stack-Based Buffer Overflow in TP-Link TL-WR940N v6 Router

Publication date: 2026-07-29

Last updated on: 2026-07-30

Assigner: TPLink

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.

CVSS Scores

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Meta Information

Published

2026-07-29

Last Modified

2026-07-30

Generated

2026-08-19

AI Q&A

2026-07-30

EPSS Evaluated

2026-08-18

NVD

CVE-2026-12935

Affected Vendors & Products

Vendor	Product	Version / Range
tp-link	tl-wr940n	6

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-121	A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).

Attack-Flow Graph

Executive Summary

This vulnerability is a stack-based buffer overflow in the RTSP connection tracking module of the TP-Link TL-WR940N v6 router. It occurs when a LAN client connects to a malicious RTSP server, which sends a specially crafted message that triggers improper memory handling in the router's kernel module.

Detection Guidance

Detecting this vulnerability requires monitoring for unusual RTSP traffic or crashes in the TL-WR940N v6 router. Check router logs for unexpected disconnections or kernel errors. Use network scanning tools like nmap to identify vulnerable devices by searching for open RTSP ports (typically 554).

Impact Analysis

Exploitation may cause a denial-of-service (DoS) condition or allow remote code execution (RCE), potentially leading to full device compromise. An unauthenticated attacker can exploit this under default device settings.

Compliance Impact

This vulnerability could potentially impact compliance with GDPR and HIPAA by enabling unauthorized access to the device, leading to data breaches or loss of control over network traffic. Exploitation may result in full compromise of the router, which could expose sensitive data or disrupt critical network functions.

Mitigation Strategies

Immediately update the router's firmware to the latest version provided by TP-Link. Disable RTSP service if not needed. Block external RTSP traffic at the network perimeter using firewall rules. Isolate the router from critical systems until patched.

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