Is CVE-2025-66274 actively exploited?

No active exploitation of CVE-2025-66274 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2025-66274 be exploited remotely?

Yes. CVE-2025-66274 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2025-66274?

CVE-2025-66274 has a CVSS score of 4.9 (MEDIUM) and an EPSS exploitation probability of 0.13%.

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MEDIUM

CVE-2025-66274

CWE-476Published: February 11, 2026· Updated: Feb 12, 2026

4.9

CVSS v3.1

EPSS:0.13%probability of exploitation in 30 daysPercentile:32.2th

Official 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

NVD Source

Technical Analysis

CVE-2025-66274 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires high privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 4.9.