Authenticated Format String Vulnerability in ONVIF AddScopes Method on TP-Link Tapo C520WS
CVE-2026-6241

6.8MEDIUM

Key Information:

Vendor

Tp-link Systems Inc.

Status
Tapo C520ws V2
Vendor
CVE Published:
5 June 2026

What is CVE-2026-6241?

An authenticated format string vulnerability is present in the ONVIF AddScopes in Tapo C520WS v2, where user-controlled input is improperly passed to formatting functions without adequate sanitization. An attacker can inject format specifiers into ONVIF scope parameters to manipulate memory handling behavior.

Successful exploitation may cause the ONVIF management service to crash, resulting in DoS condition that impacts normal device operation.

Affected Version(s)

Tapo C520WS v2 0 < 1.2.6 Build 260528

References

https://www.tp-link.com/us/support/download/tapo-c520ws/#...
patch
https://www.tp-link.com/en/support/download/tapo-c520ws/#...
patch
https://www.tp-link.com/us/support/faq/5120/
vendor-advisory

CVSS V4

Score:
6.8
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Adjacent Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.