CVE-2026-6242

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

Published Jun 5, 2026 CVSS 4.0 · 6.8 Medium EPSS < 1% KEV · Not listed
Description
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Tp-link
Tp-link tapo C520ws V2
Vendors & Products Tp-link
Tp-link tapo C520ws V2
Type Values Removed Values Added
Description 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.
Title Authenticated Format String Vulnerability in ONVIF Subscribe Service on TP-Link Tapo C520WS
Weaknesses CWE-134
References
Metrics cvssV4_0

{'score': 6.8, '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
TPLink
Published
Updated
Jun 8, 2026, 1:17 PM
Reserved
Apr 13, 2026, 5:10 PM
Status
Deferred
Published
Jun 6, 2026, 12:16 AM
Modified
Jul 23, 2026, 7:10 AM