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

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Summary

CVECVE-2026-6241
StatePUBLISHED
AssignerTPLink
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-06 00:16:41 UTC
Updated2026-06-06 00:16:41 UTC
DescriptionAn 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.

Risk And Classification

Primary CVSS: v4.0 6.8 MEDIUM from f23511db-6c3e-4e32-a477-6aa17d310630

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS: 0.000140000 probability, percentile 0.025190000 (date 2026-06-07)

Problem Types: CWE-134 | CWE-134 CWE-134 Use of Externally-Controlled format string

VersionSourceTypeScoreSeverityVector
4.0f23511db-6c3e-4e32-a477-6aa17d310630Secondary6.8MEDIUMCVSS:4.0/AV:A/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/C...
4.0CNACVSS6.8MEDIUMCVSS: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 Breakdown

Attack Vector
Adjacent
Attack Complexity
Low
Attack Requirements
None
Privileges Required
High
User Interaction
None
Confidentiality
None
Integrity
None
Availability
High
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA TP-Link Systems Inc. Tapo C520WS V2 affected 1.2.6 Build 260528 custom Not specified

References

ReferenceSourceLinkTags
www.tp-link.com/us/support/faq/5120 f23511db-6c3e-4e32-a477-6aa17d310630 www.tp-link.com
www.tp-link.com/en/support/download/tapo-c520ws f23511db-6c3e-4e32-a477-6aa17d310630 www.tp-link.com
www.tp-link.com/us/support/download/tapo-c520ws f23511db-6c3e-4e32-a477-6aa17d310630 www.tp-link.com
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