CVE-2025-53591
moderate-risk
Published 2026-01-02
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
Do I need to act?
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0.06% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
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Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
6
CVSS 6.5/10
Medium
NETWORK
/ LOW complexity
Affected Products (20)
Affected Vendors
References (1)
Vendor Advisory
https://www.qnap.com/en/security-advisory/qsa-25-50
47
/ 100
moderate-risk
Severity
24/34 · High
Exploitability
0/34 · Minimal
Exposure
23/34 · High