Vulnerability · Published Jun 5, 2026 · Assigned by TPLink
CVE-2026-6242Authenticated Format String Vulnerability in ONVIF Subscribe Service on TP-Link Tapo C520WS
Medium 6.8
In plain English
A medium-severity security flaw in Tapo C520WS v2 from TP-Link Systems Inc.. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 7% of all known vulnerabilities).
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| TP-Link Systems Inc. | Tapo C520WS v2 | 0 – before 1.2.6 Build 260528 |
Weakness: CWE-134 · 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