CVE-2025-66274 PUBLISHED

QuTS hero

Assigner: qnap
Reserved: 26.11.2025 Published: 11.02.2026 Updated: 11.02.2026

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 version: QuTS hero h5.3.2.3354 build 20251225 and later

Metrics

CVSS 4.0

CVSS 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/E:U
CVSS Score: 1.2

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	Low	Integrity	None
Attack Requirements	None	Availability	Low	Availability	None
Privileges Required	High
User Interaction	None

CVSS 4.0

Product Status

Vendor	QNAP Systems Inc.
Product	QuTS hero
Versions	Default: unaffected affected from ? to h5.3.2.3354 build 20251225 (excl.)

Solutions

We have already fixed the vulnerability in the following version: QuTS hero h5.3.2.3354 build 20251225 and later

Credits

coral finder

References

https://www.qnap.com/en/security-advisory/qsa-26-08

Problem Types

CWE-476 CWE

Impacts

CAPEC-129