What is the severity of ZDI-CAN-13993?

The severity of ZDI-CAN-13993 is considered critical as it allows remote code execution on affected TP-Link TL-WR940N routers.

How do I fix ZDI-CAN-13993?

To fix ZDI-CAN-13993, update the firmware of your TP-Link TL-WR940N router to the latest version provided by the manufacturer.

Who is affected by ZDI-CAN-13993?

ZDI-CAN-13993 affects installations of TP-Link TL-WR940N routers that have the vulnerable httpd service open on TCP port 80.

Can ZDI-CAN-13993 be exploited without authentication?

No, ZDI-CAN-13993 requires authentication, meaning that an attacker must have valid credentials to exploit the vulnerability.

What is the primary flaw in ZDI-CAN-13993?

The primary flaw in ZDI-CAN-13993 lies in the httpd service of the TP-Link TL-WR940N routers, which can be exploited for arbitrary code execution.

Vulnerability/
ZDI-CAN-13993

medium

6.8

24/3/2025

ZDI-CAN-13993: TP-Link TL-WR940N httpd newBridgessid Stack-based Buffer Overflow Remote Code Execution Vulnerability

This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of TP-Link TL-WR940N routers. Authentication is required to exploit this vulnerability. The specific flaw exists within the httpd service, which listens on TCP port 80 by default. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of root.

Affected Software	Affected Version	How to fix
TP-Link TL-WR940N V2 Firmware

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Reference Links

https://www.zerodayinitiative.com/advisories/ZDI-22-407/

Frequently Asked Questions

What is the severity of ZDI-CAN-13993?
The severity of ZDI-CAN-13993 is considered critical as it allows remote code execution on affected TP-Link TL-WR940N routers.
How do I fix ZDI-CAN-13993?
To fix ZDI-CAN-13993, update the firmware of your TP-Link TL-WR940N router to the latest version provided by the manufacturer.
Who is affected by ZDI-CAN-13993?
ZDI-CAN-13993 affects installations of TP-Link TL-WR940N routers that have the vulnerable httpd service open on TCP port 80.
Can ZDI-CAN-13993 be exploited without authentication?
No, ZDI-CAN-13993 requires authentication, meaning that an attacker must have valid credentials to exploit the vulnerability.
What is the primary flaw in ZDI-CAN-13993?
The primary flaw in ZDI-CAN-13993 lies in the httpd service of the TP-Link TL-WR940N routers, which can be exploited for arbitrary code execution.

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collector/zdi-advisory
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alias/ZDI-22-407
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vendor/tp-link
canonical/tp-link tl-wr940n v2 firmware

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