CVE-2025-52426: several QNAP operating system versions: QTS: NULL pointer dereference vulnerability
This QNAP advisory covers CVE-2025-52426 in QTS 5.2.x, QuTS hero h5.2.x and QuTS hero h5.3.x.
- CVE-2025-52426
Key facts
- Vendor rating
- Medium, CVSS 4.9
- CISA KEV
- Not listed (catalogue checked )
- Fixed in
- 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 and 1 more below
- Source published
- Source revised
- Listed by VulniPulse
Compiled by VulniPulse from the linked sources. How records are collected and checked.
Affected products & platforms
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 versions: QTS 5.2.7.3256 build 20250913 and later
QuTS hero h5.3.1.3250 build 20250912 and later
Affected products named by the advisory: QTS 5.2.x; QuTS hero h5.2.x; QuTS hero h5.3.x.
Text from the source record.
How to fix CVE-2025-52426
Upgrade to a fixed release named by QNAP:
- 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
- QTS 5.2.x
Vendor guidance
- Update the affected QNAP app / operating system to a fixed release: 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, QTS 5.2.x.
End-of-life dates for QNAP QTS
More QNAP advisories
CVE-2025-52863Jan 2, 2026several QNAP operating system versions: QTS: buffer overflow vulnerabilityCVE-2025-52430Jan 2, 2026several QNAP operating system versions: QTS: NULL pointer dereference vulnerabilityCVE-2025-62849Dec 16, 2025several QNAP operating system versions: QTS: SQL injection vulnerabilityCVE-2025-59385Dec 16, 2025several QNAP operating system versions: QTS: authentication bypass by spoofingCVE-2025-52433Oct 3, 2025several QNAP operating system versions: QTS: NULL pointer dereference vulnerabilityCVE-2025-48729Oct 3, 2025several QNAP operating system versions: QTS: NULL pointer dereference vulnerability
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