Medium severity · published Feb 11, 2026
CVE-2025-58466
QTS, QuTS hero
4.9
CVSS
0.6%
EPSS
No
On KEV
Description
A use of uninitialized variable 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 denial of service conditions, or modify control flow in unexpected ways.
We have already fixed the vulnerability in the following versions:
QTS 5.2.8.3332 build 20251128 and later
QuTS hero h5.2.8.3321 build 20251117 and later
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 48% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
QT
QTS · QNAP Systems Inc.
5.2.x before 5.2.8.3332 build 20251128 · source: vendor, NVD
QH
QuTS hero · QNAP Systems Inc.
h5.2.x before h5.2.8.3321 build 20251117 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-58466
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-58466
Vendor Advisory
https://www.qnap.com/en/security-advisory/qsa-26-05
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QuTS hero is not affected