CVE-2026-6242 MEDIUM

CVE-2026-6242: Authenticated Format String Vulnerability in ONVIF Subscribe Service on TP-Link Tapo C520WS

Vendor Tp-Link Systems Inc.
Product Tapo C520WS v2
Weakness CWE-134
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

An authenticated format string vulnerability exists in the ONVIF Subscribe service in Tapo C520WS v2 due to improper handling of externally supplied parameters within formatting functions. An attacker may inject crafted format strings into event subscription requests or notification generation path to disrupt normal service execution. Successful exploitation may cause the event notification service to terminate unexpectedly, resulting in the loss of real-time alarm functionality and disruption of event notifications.

Key dates

02Disclosure timeline

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