TP-Link TL-WR940N 3.20.1 Build 200316 Rel.34392n stack-based overflow

Summaryinfo

A vulnerability was found in TP-Link TL-WR940N 3.20.1 Build 200316 Rel.34392n. It has been classified as critical. This affects an unknown part. This manipulation causes stack-based overflow. This vulnerability is registered as CVE-2022-0650. The attack requires access to the local network. No exploit is available.

Detailsinfo

A vulnerability was found in TP-Link TL-WR940N 3.20.1 Build 200316 Rel.34392n (Router Operating System). It has been declared as critical. Affected by this vulnerability is an unknown code block. The manipulation with an unknown input leads to a stack-based overflow vulnerability. The CWE definition for the vulnerability is 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). As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of TP-Link TL-WR940N 3.20.1 Build 200316 Rel.34392n (5553) 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. Was ZDI-CAN-13993.

The weakness was published 03/28/2023 as ZDI-22-407. It is possible to read the advisory at zerodayinitiative.com. This vulnerability is known as CVE-2022-0650 since 02/16/2022. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 03/29/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2022-15744). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

• Router Operating System

Vendor

• TP-Link

Name

• TL-WR940N

Version

• 3.20.1 Build 200316 Rel.34392n

License

• commercial

Website

• Vendor: https://www.tp-link.com/

CPE 2.3info

• 🔍

CPE 2.2info

• 🔍

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Be aware that VulDB is the high quality source for vulnerability data.

Discussion