CVE-2025-66274
NULL Pointer Dereference in QNAP OS Allows Admin-Triggered DoS
Publication date: 2026-02-11
Last updated on: 2026-02-12
Assigner: QNAP Systems, Inc.
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| qnap | quts_hero | h5.3.0.3115 |
| qnap | quts_hero | h5.3.0.3145 |
| qnap | quts_hero | h5.3.0.3192 |
| qnap | quts_hero | h5.3.1.3250 |
| qnap | quts_hero | h5.3.1.3292 |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-476 | The product dereferences a pointer that it expects to be valid but is NULL. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability is a NULL pointer dereference issue affecting several versions of the QNAP operating system. It occurs when a remote attacker who has already obtained an administrator account exploits this flaw to cause the system to crash or become unavailable, resulting in a denial-of-service (DoS) attack.
How can this vulnerability impact me? :
If exploited, this vulnerability can cause a denial-of-service condition on affected QNAP devices. This means that the system could become unresponsive or crash, disrupting normal operations and potentially causing downtime.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
I don't know
How can this vulnerability be detected on my network or system? Can you suggest some commands?
I don't know
What immediate steps should I take to mitigate this vulnerability?
To mitigate this vulnerability, you should upgrade your QNAP operating system to QuTS hero version h5.3.2.3354 build 20251225 or later, where the issue has been fixed.
Additionally, restrict administrator account access to trusted users only, as exploitation requires an attacker to have administrator privileges.