CVE-2025-53589: A NULL pointer dereference vulnerability has been reported to affect several QNAP operating system versions. If a…
CVE-2025-53589 · Severity: medium · CVSS 4.9 · Published 2026-01-02
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 h5.2.7.3256 build 20250913 and later
QuTS hero h5.3.1.3250 build 20250912 and later
No. Junglewise Threat Intelligence has no report of CVE-2025-53589 being exploited in the wild.
How severe is CVE-2025-53589?
Medium severity, with a CVSS score of 4.9, published 2 January 2026.
Which products and versions are affected?
QNAP QTS, QNAP Quts Hero. The advisory does not name versions.
Is there a fix for CVE-2025-53589?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
Am I affected by CVE-2025-53589?
Check whether you run QNAP QTS or QNAP Quts Hero. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.