Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2026-6239

Severity CVSS v4.0:
MEDIUM
Type:
CWE-121 Stack-based Buffer Overflow
Publication date:
06/06/2026
Last modified:
06/06/2026

Description

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

Impact

Vector 4.0
CVSS:4.0/AV:A/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVSS v4.0 Severity and Metrics:

Base Score: 6.80 MEDIUM
Vector: CVSS:4.0/AV:A/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Attack Vector (AV): Adjacent
Attack Complexity (AC): Low
Attack Requirements (AT): None
Privileges Required (PR): High
User Interaction (UI): None
Confidentiality (VC): None
Integrity (VI): None
Availability (VA): High
Confidentiality (SC): None
Integrity (SI): None
Availability (SA): None

Base Score 4.0
6.80
Severity 4.0
MEDIUM

References to Advisories, Solutions, and Tools