TP-Link Tapo C520WS v2 ONVIF CreateUsers Service stack-based overflow

Summaryinfo

A vulnerability classified as critical was found in TP-Link Tapo C520WS v2. This issue affects some unknown processing of the component ONVIF CreateUsers Service. The manipulation results in stack-based overflow. This vulnerability is cataloged as CVE-2026-6239. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability classified as critical has been found in TP-Link Tapo C520WS v2 (version unknown). Affected is an unknown function of the component ONVIF CreateUsers Service. The manipulation with an unknown input leads to a stack-based overflow vulnerability. CWE is classifying the issue as 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). This is going to have an impact on availability. CVE summarizes:

A stack‑based buffer overflow vulnerability exists in Tapo C520WS v2 in the ONVIF CreateUsers service, where the device fails to properly validate the number of XML user nodes during request processing. An authenticated attacker can send a specially crafted ONVIF request containing an excessive number of user entries to trigger memory corruption. Successful exploitation may cause the ONVIF management service to terminate unexpectedly, resulting in a denial‑of‑service (DoS) condition that disrupts device configuration and management functions.

The advisory is available at tp-link.com. This vulnerability is traded as CVE-2026-6239 since 04/13/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. Additional levels of successful authentication are needed for exploitation. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 06/06/2026).

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

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Productinfo

Vendor

• TP-Link

Name

• Tapo C520WS v2

License

• commercial

Website

• Vendor: https://www.tp-link.com/

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