Medium severity · published Feb 11, 2026
CVE-2025-59386
A NULL pointer dereference vulnerability has been reported to affect several QNAP operating system versions
4.9
CVSS
0.4%
EPSS
No
On KEV
Description
A NULL pointer dereference 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 launch a denial-of-service (DoS) attack.
We have already fixed the vulnerability in the following version:
QuTS hero h5.3.2.3354 build 20251225 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)0.4% · higher than 37% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
QH
Quts Hero · Qnap
h5.3.0.3115; h5.3.0.3145; h5.3.0.3192; h5.3.1.3250; h5.3.1.3292 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-59386
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-59386
Vendor Advisory
https://www.qnap.com/en/security-advisory/qsa-26-08
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