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CVE-2025-66274

QTS, QuTS hero

MEDIUM
4.9
CVSS Score
Published: February 11, 2026 at 12:15 PM UTC
Updated: June 17, 2026 at 09:56 AM UTC
2 products affected across 1 vendorQuTS heroQTS

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Severity
MEDIUM4.9
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

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 version: QuTS hero h5.3.2.3354 build 20251225 and later

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

QuTS hero· Qnap
95%
? ≤ v < h6.0.0.3397 build 20260206h5.2.0 ≤ v < h5.2.9.3410 build 20260214h5.3.0 ≤ v < h5.3.2.3354 build 20251225?h5.2.0h5.3.0h5.3.0.3115 build_20250430h5.3.0.3145 build_20250530h5.3.0.3192 build_20250716h5.3.1.3250 build_20250912h5.3.1.3292 build_20251024
Affected range stops below h5.2.9.3410 build 20260214, so it looks safe — our inference, not a vendor statement
Affected range stops below h5.3.2.3354 build 20251225, so it looks safe — our inference, not a vendor statement
Affected range stops below h6.0.0.3397 build 20260206, so it looks safe — our inference, not a vendor statement
QTS· Qnap
60%
5.2.0 ≤ v < 5.2.9.3410 build 202602145.2.0
Affected range stops below 5.2.9.3410 build 20260214, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor Advisory
Source: cverecord
https://www.qnap.com/en/security-advisory/qsa-26-08

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

4.9MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-476

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