CVE-2026-6240 Authenticated Stack-based Buffer Overflow in ONVIF DeleteUsers Service on TP-Link Tapo C520WS
An authenticated attacker can cause a denial of service on TP-Link Tapo C520WS cameras by triggering a stack-based buffer overflow in the ONVIF DeleteUsers service.
- 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-2026-6240?
CVE-2026-6240 is a medium-severity memory corruption 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
A stack-based buffer overflow vulnerability exists in Tapo C520WS v2 in the ONVIF DeleteUsers service, due to insufficient boundary checks when handling multiple user deletion parameters. An authenticated attacker can send a crafted malicious request containing an excessive number of identifiers to overflow stack memory.
Successful exploitation may result in a service crash or deadlock, leading to DoS affecting device management and monitoring functionality.
Weakness: CWE-121
Which versions are affected by CVE-2026-6240?
How do I fix CVE-2026-6240?
No fix has been published for CVE-2026-6240 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-6240 being exploited?
There is no known exploitation of CVE-2026-6240 in the wild and no public exploit code.
Sources
Also known as GHSA-qv33-m6vq-mqmr.