CVE-2026-6240 MEDIUM

CVE-2026-6240: Authenticated Stack-based Buffer Overflow in ONVIF DeleteUsers Service on TP-Link Tapo C520WS

Vendor Tp-Link Systems Inc.
Product Tapo C520WS v2
Weakness CWE-121
Published June 5, 2026
Last update June 8, 2026

CVSS base score

6.8/10
Attack vector Adjacent
Attack complexity Low
Privileges required High
User interaction None
Confidentiality
Integrity

CVSS 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

What the vulnerability does

01Description

A stack-based buffer overflow vulnerability exists in Tapo C520WS v2 in the ONVIF DeleteUsers service, due to insufficient boundary checks when handling multiple user deletion parameters. An authenticated attacker can send a crafted malicious request containing an excessive number of identifiers to overflow stack memory. Successful exploitation may result in a service crash or deadlock, leading to DoS affecting device management and monitoring functionality.

Key dates

02Disclosure timeline

June 5, 2026 CVE published
June 8, 2026 Record updated