CVE-2026-6242 Authenticated Format String Vulnerability in ONVIF Subscribe Service on TP-Link Tapo C520WS
An authenticated attacker can cause denial of service in the ONVIF Subscribe service of TP-Link Tapo cameras by injecting format strings.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-6242?
CVE-2026-6242 is a medium-severity vulnerability in TP-Link Systems Inc. Tapo C520WS v2, published on 5 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.
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.
Weakness: CWE-134
Which versions are affected by CVE-2026-6242?
How do I fix CVE-2026-6242?
No fix has been published for CVE-2026-6242 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-6242 being exploited?
There is no known exploitation of CVE-2026-6242 in the wild and no public exploit code.
Sources
Also known as GHSA-m9ww-xwm5-pf57.