Main Vulnerability Database Vulnerabilities #VU134947

NULL pointer dereference in QNAP Systems, Inc. products - CVE-2025-66281

Published: June 19, 2026

Vulnerability identifier: #VU134947

CSH Severity: Medium

CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]

CVE-ID: CVE-2025-66281

CWE-ID: CWE-476

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dereference error. A remote attacker can pass specially crafted data to the application and perform a denial of service (DoS) attack.

Affected software

QuTScloud
QuTS hero
QVP (QVR Pro appliances)
QNAP QTS

How to mitigate CVE-2025-66281

Install updates from vendor's website.

QuTScloud - update to
QuTScloud - update to c5.2.9
QuTS hero - update to h5.2.9
QVP (QVR Pro appliances) - update to 2.8.0
QNAP QTS - update to 5.2.10

External References

https://www.qnap.com/en/security-advisory/qsa-26-10

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