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CVE-2025-66281

QTS, QuTS hero

CVSS 6.9 MEDIUMEPSS 0.5%CWE-476
Vexday Risk Score
13Low
SSVC decision (CISA)
Track
No exploitation signal → monitor
CVSS 6.9EPSS 0.5%KEV nãoPoC —Nuclei —Metasploit —Patch —
Lifecycle
10 Jun 2026Published on NVD
Recommendation: Monitor — no exploitation signal at the moment.
A NULL pointer dereference vulnerability has been reported to affect several QNAP operating system versions. The remote attackers can then exploit the vulnerability to launch a denial-of-service (DoS) attack. We have already fixed the vulnerability in the following versions: QTS 5.2.9.3410 build 20260214 and later QuTS hero h5.2.9.3410 build 20260214 and later QuTS hero h5.3.4.3500 build 20260520 and later QuTS hero h6.0.0.3397 build 20260206 and later
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
Affected products
QNAP Systems Inc. · QTSQNAP Systems Inc. · QuTS hero

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