TP-Link TL-WR841N Embedded HTTP Service boundary buffer overflow

Summaryinfo

A vulnerability has been found in TP-Link TL-WR841N and classified as very critical. Affected is an unknown function of the component Embedded HTTP Service. Performing a manipulation of the argument boundary results in buffer overflow. This vulnerability is known as CVE-2026-76651. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability classified as very critical has been found in TP-Link TL-WR841N (the affected version unknown). This affects an unknown part of the component Embedded HTTP Service. The manipulation of the argument boundary with an unknown input leads to a buffer overflow vulnerability. CWE is classifying the issue as CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

A buffer overflow vulnerability exists in the embedded HTTP service in TL-WR841N v14 when processing multipart/form-data requests. Insufficient validation of an attacker-controlled boundary parameter may allow a remote unauthenticated attacker to submit a crafted request that corrupts memory by overwriting data beyond the bounds of an internal buffer. Successful exploitation may result in modification or corruption of process memory, potentially leading to undefined application behavior. Arbitrary code execution, information disclosure, and denial-of-service conditions have not been demonstrated.

The advisory is shared at tp-link.com. This vulnerability is uniquely identified as CVE-2026-76651 since 08/19/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/29/2026).

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

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Router Operating System

Vendor

• TP-Link

Name

• TL-WR841N

License

• commercial

Website

• Vendor: https://www.tp-link.com/

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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