Medium [CVE-2025-53405] QTS: NULL pointer dereference vulnerability has been reported to affect several QNAP operating system versions.
This medium-severity QNAP advisory covers CVE-2025-53405 affecting QTS 5.2.x, QuTS hero h5.2.x, QuTS hero h5.3.x.
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Summary
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.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 15 days ago·verify at source
- 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
Official advisory · high-confidence parse· fetched 15 days ago·verify at source
Mitigation checklist
- 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.
Official advisory · high-confidence parse· fetched 15 days ago·verify at source
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