CVE-2025-66274

MEDIUM

QNAP QuTS hero - Denial of Service via NULL Pointer Dereference

Title source: llm
STIX 2.1

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

References (1)

Core 1
Core References

Scores

CVSS v3 4.9
EPSS 0.0037
EPSS Percentile 28.6%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-476
Status published
Products (9)
qnap/quts_hero h5.3.0.3115 build_20250430
qnap/quts_hero h5.3.0.3145 build_20250530
qnap/quts_hero h5.3.0.3192 build_20250716
qnap/quts_hero h5.3.1.3250 build_20250912
qnap/quts_hero h5.3.1.3292 build_20251024
QNAP Systems Inc./QTS 5.2.0 - 5.2.9.3410 build 20260214
QNAP Systems Inc./QuTS hero ? - h6.0.0.3397 build 20260206
QNAP Systems Inc./QuTS hero h5.2.0 - h5.2.9.3410 build 20260214
QNAP Systems Inc./QuTS hero h5.3.0 - h5.3.2.3354 build 20251225
Published Feb 11, 2026
Tracked Since Feb 18, 2026