CVE-2025-66281CWE-476

QTS, QuTS hero

Medium · published June 10, 2026

CVSS v4.0
6.9
EPSS
0%
Percentile
38.6
In the wild
Unconfirmed
What it is

A NULL pointer dereference vulnerability has been reported to affect several QNAP operating system versions. The remote attackers 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 h5.3.4.3500 build 20260520 and later

QuTS hero h6.0.0.3397 build 20260206 and later

The record
Technical detail
CVSS v4.0
6.9 · MEDIUM
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
EPSS
0.00456 · 38.6th percentile
Weakness
CWE-476 · NULL Pointer Dereference
Published
2026-06-10T03:06Z
EPSS history
Timeline
  • 10 JUN 03:06Z
    QTS, QuTS hero
    cvelistv5