Authenticated Format String Vulnerability in ONVIF Subscribe Service on TP-Link Tapo C520WS

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Summary

CVECVE-2026-6242
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 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.

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

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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