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Vulnerabilities

Vulnerability · CVE-2025-59386

A NULL pointer dereference vulnerability has been reported to affect several QNAP operating system versions.

Published Feb 11, 2026 · catalog updated Feb 27, 2026 · QNAP Systems Inc. QuTS hero

Last checked Nov 7, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2025-59386. EPSS is 0.44%. Act only if a listed version of QNAP Systems Inc. QuTS hero is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Low1.2
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.44%
Remediation
Version ranges on file
Affected products
vendor QNAP Systems Inc. QuTS hero h5.3.x <h5.3.2.3354 build 20251225

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

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor QNAP Systems Inc. QuTS hero h5.3.x <h5.3.2.3354 build 20251225h5.3.x <h5.3.2.3354 build 20251225

How to fix CVE-2025-59386

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-59386. EPSS is 0.44%. Act only if a listed version of QNAP Systems Inc. QuTS hero is installed.

Which versions are affected?

Compare what you have installed with QNAP Systems Inc. QuTS hero h5.3.x <h5.3.2.3354 build 20251225 h5.3.x <h5.3.2.3354 build 20251225. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.44%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

QNAP QTS security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Feb 11, 2026 · EUVD

    Detected

    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

  2. Feb 27, 2026 · EUVD

    Updated

    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

Sources

  • CVE.orgVulnerability recordCVE-2025-59386

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-59386

    30-day exploitation probability 0.44%

    first.org
  • EUVDVulnerability recordEUVD-2025-207459

    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 vulnerab

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Nov 7, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSNov 7, 2026
  • CVE.orgNov 4, 2026
  • EUVDNov 2, 2026