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CVE-2025-53591

QTS, QuTS hero

CVSS 1.2 LOWEPSS 0.3%CWE-134
Vexday Risk Score
8Low
SSVC decision (CISA)
Track
No exploitation signal → monitor
CVSS 1.2EPSS 0.3%KEV nãoPoC —Nuclei —Metasploit —Patch —
Lifecycle
02 Jan 2026Published on NVD
Recommendation: Monitor — no exploitation signal at the moment.
A use of externally-controlled format string 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 obtain secret data or modify memory. We have already fixed the vulnerability in the following versions: QTS 5.2.7.3256 build 20250913 and later QuTS hero h5.2.7.3256 build 20250913 and later QuTS hero h5.3.1.3250 build 20250912 and later
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U
Affected products
QNAP Systems Inc. · QTSQNAP Systems Inc. · QuTS hero

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References
https://www.qnap.com/en/security-advisory/qsa-25-50