TP-Link Tapo C520WS 2.6 Configuration Parameter stack-based overflow

Summaryinfo

A vulnerability categorized as critical has been discovered in TP-Link Tapo C520WS 2.6. Impacted is an unknown function of the component Configuration Parameter Handler. Executing a manipulation can lead to stack-based overflow. The identification of this vulnerability is CVE-2026-34122. The attack needs to be done within the local network. There is no exploit available.

Detailsinfo

A vulnerability has been found in TP-Link Tapo C520WS 2.6 and classified as critical. This vulnerability affects an unknown functionality of the component Configuration Parameter Handler. 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. CVE summarizes:

A stack-based buffer overflow vulnerability was identified in TP-Link Tapo C520WS v2.6 within a configuration handling component due to insufficient input validation. An attacker can exploit this vulnerability by supplying an excessively long value for a vulnerable configuration parameter, resulting in a stack overflow. Successful exploitation results in Denial-of-Service (DoS) condition, leading to a service crash or device reboot, impacting availability.

The advisory is shared for download at tp-link.com. This vulnerability was named CVE-2026-34122 since 03/25/2026. The exploitation appears to be easy. The attack can only be done within the local network. No form of authentication is required for a successful exploitation. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 04/02/2026).

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-2026-18434). Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

• TP-Link

Name

• Tapo C520WS

Version

• 2.6

License

• commercial

Website

• Vendor: https://www.tp-link.com/

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Once again VulDB remains the best source for vulnerability data.

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