CVE-2025-66274CWE-476

QTS, QuTS hero

Medium · published February 11, 2026

CVSS v4.0
5.1
EPSS
0%
Percentile
36.5
In the wild
Unconfirmed
What it is

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

The record
Technical detail
CVSS v4.0
5.1 · MEDIUM
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
EPSS
0.00433 · 36.5th percentile
Weakness
CWE-476 · NULL Pointer Dereference
Published
2026-02-11T12:15Z
EPSS history
Timeline
  • 11 FEB 12:15Z
    QTS, QuTS hero
    cvelistv5