CVE-2025-66274

4.9 MEDIUM

A NULL pointer dereference vulnerability has been reported to affect several QNAP operating system versions

Published: 2026-02-11 · Last updated: 2026-06-09

Severity and scoring

CVSS: 4.9 MEDIUM
Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
CWE: CWE-476

Affected products

Vendor	Product
qnap	quts_hero

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

Source: NVD

References

[NVD]https://nvd.nist.gov/vuln/detail/CVE-2025-66274
[Vendor advisory]https://www.qnap.com/en/security-advisory/qsa-26-08

Related CVEs

Same vendor

CVE-2026-26241 — A buffer overflow vulnerability has been reported to affect File Station 5 (9.1 CRITICAL)
CVE-2026-26240 — A buffer overflow vulnerability has been reported to affect File Station 5 (9.1 CRITICAL)
CVE-2026-26239 — A buffer overflow vulnerability has been reported to affect File Station 5 (8.1 HIGH)
CVE-2026-26237 — A missing authorization vulnerability has been reported to affect QuMagie (7.5 HIGH)
CVE-2026-24724 — An incorrect authorization vulnerability has been reported to affect File Station 6 (8.1 HIGH)

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