CVE-2026-6239
Deferred Deferred - Pending Action
Stack-Based Buffer Overflow in Tapo C520WS v2 ONVIF Service

Publication date: 2026-06-06

Last updated on: 2026-06-08

Assigner: TPLink

Description
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.
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Meta Information
Published
2026-06-06
Last Modified
2026-06-08
Generated
2026-06-27
AI Q&A
2026-06-06
EPSS Evaluated
2026-06-25
NVD
CVE-2026-6239
EUVD
EUVD-2026-34934
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
tp_link tapo_c520ws 2
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
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).
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Mitigation Strategies

The CVE description does not provide specific mitigation steps or recommended commands for CVE-2026-6239.

Since the vulnerability affects the ONVIF CreateUsers service on the TP-Link Tapo C520WS v2 device, general best practices include restricting authenticated access to trusted users only and monitoring for unusual ONVIF requests.

Executive Summary

This vulnerability is a stack-based buffer overflow found in the Tapo C520WS v2 device within the ONVIF CreateUsers service. The device does not properly validate the number of XML user nodes when processing requests. An authenticated attacker can exploit this by sending a specially crafted ONVIF request with too many user entries, which causes memory corruption.

Impact Analysis

If successfully exploited, this vulnerability can cause the ONVIF management service on the device to crash unexpectedly. This results in a denial-of-service (DoS) condition that disrupts the device's configuration and management functions, potentially preventing legitimate users from managing the device.

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