CVE-2025-66274 QTS, QuTS hero
Remote attackers with admin access can cause denial of service via a null pointer dereference in QNAP operating systems.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-66274?
CVE-2025-66274 is a medium-severity vulnerability in Qnap Quts Hero, published on 11 Feb 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
A NULL pointer dereference vulnerability has been reported to affect several QNAP operating system versions. If a remote attacker gains an administrator account, they can then exploit the vulnerability to launch a denial-of-service (DoS) attack.
We have already fixed the vulnerability in the following versions: QTS 5.2.9.3410 build 20260214 and later QuTS hero h5.2.9.3410 build 20260214 and later QuTS hero h5.3.2.3354 build 20251225 and later QuTS hero h6.0.0.3397 build 20260206 and later
Weakness: CWE-476
Which versions are affected by CVE-2025-66274?
It affects 1 product.
Products include Qnap Quts Hero.
How do I fix CVE-2025-66274?
No fix has been published for CVE-2025-66274 yet. Limit exposure of the affected software until one is available.
Is CVE-2025-66274 being exploited?
There is no known exploitation of CVE-2025-66274 in the wild and no public exploit code.
Other vulnerabilities in Qnap Quts Hero
Sources
Also known as GHSA-vf98-8xxx-fp8w.