CVE-2026-6242: CWE-134 Use of Externally-Controlled format string in TP-Link Systems Inc. Tapo C520WS v2
CVE-2026-6242 is an authenticated format string vulnerability in the ONVIF Subscribe service of TP-Link Tapo C520WS v2 cameras. It arises from improper handling of externally supplied parameters in formatting functions, allowing crafted format strings to disrupt event notification services. Exploitation can cause the event notification service to terminate unexpectedly, leading to loss of real-time alarm functionality and disruption of event notifications. The vulnerability has a CVSS 4. 0 base score of 6. 8, indicating medium severity. No patch or official remediation guidance is currently available, and no known exploits are reported in the wild.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-6242) affects the TP-Link Tapo C520WS v2 camera's ONVIF Subscribe service. It is a CWE-134 format string issue where authenticated attackers can inject malicious format strings into event subscription requests or notification generation paths. This improper input handling can cause the event notification service to crash, disrupting alarm and notification functionality. The CVSS 4.0 vector indicates the attack requires adjacent network access with low complexity and high privileges, but no user interaction. No vendor-provided patch or mitigation details are currently available.
Potential Impact
Successful exploitation results in termination of the event notification service, causing loss of real-time alarm functionality and disruption of event notifications. This impacts the reliability of security monitoring dependent on the device's event notifications. There is no indication of code execution or data disclosure from the provided information.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict access to the ONVIF Subscribe service to trusted administrators only, and monitor device behavior for unexpected service interruptions. No official patch or workaround is currently documented.
CVE-2026-6242: CWE-134 Use of Externally-Controlled format string in TP-Link Systems Inc. Tapo C520WS v2
Description
CVE-2026-6242 is an authenticated format string vulnerability in the ONVIF Subscribe service of TP-Link Tapo C520WS v2 cameras. It arises from improper handling of externally supplied parameters in formatting functions, allowing crafted format strings to disrupt event notification services. Exploitation can cause the event notification service to terminate unexpectedly, leading to loss of real-time alarm functionality and disruption of event notifications. The vulnerability has a CVSS 4. 0 base score of 6. 8, indicating medium severity. No patch or official remediation guidance is currently available, and no known exploits are reported in the wild.
CVSS v4.0
Score 6.8medium
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-6242) affects the TP-Link Tapo C520WS v2 camera's ONVIF Subscribe service. It is a CWE-134 format string issue where authenticated attackers can inject malicious format strings into event subscription requests or notification generation paths. This improper input handling can cause the event notification service to crash, disrupting alarm and notification functionality. The CVSS 4.0 vector indicates the attack requires adjacent network access with low complexity and high privileges, but no user interaction. No vendor-provided patch or mitigation details are currently available.
Potential Impact
Successful exploitation results in termination of the event notification service, causing loss of real-time alarm functionality and disruption of event notifications. This impacts the reliability of security monitoring dependent on the device's event notifications. There is no indication of code execution or data disclosure from the provided information.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict access to the ONVIF Subscribe service to trusted administrators only, and monitor device behavior for unexpected service interruptions. No official patch or workaround is currently documented.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- TPLink
- Date Reserved
- 2026-04-13T17:10:28.804Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a23675be29bf47b50dbe8e2
Added to database: 6/6/2026, 12:18:35 AM
Last enriched: 6/6/2026, 12:33:36 AM
Last updated: 6/6/2026, 2:36:23 AM
Views: 9
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