4.9

CVE-2025-59386: qnap systems inc. quts hero NULL Pointer Dereference

CVSS: 4.9v3.1MediumAnalyzed
Published 11-02-2026Last modified 27-02-2026
Open JSON

Vulnerability summary

CVE-2025-59386 is a medium (CVSS 4.9) NULL Pointer Dereference vulnerability in qnap systems inc. quts hero. EPSS estimates a 0.43% chance of exploitation in the next 30 days, higher than 36% of scored vulnerabilities.

Overall risk
20/100
0100
Low · default modelHow is this calculated?
CVSS score
4.9/10
010
Medium · v3.1 (NVD)
EPSS score
0.43%
0%100%
Low · +0.05 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 11-02-2026
    PublishedVulnerability first disclosed.
  2. 27-02-2026
    Last modifiedVulnerability information updated.

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 metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

0.43%

Chance of exploitation in the next 30 days

Percentile

36%

Versus all other CVEs

30-day change

+0.05 pp

From 0.38% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.43%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Qnap1 product
  • quts_heroh5.3.0.3115:build_20250430 | h5.3.0.3145:build_20250530 | h5.3.0.3192:build_20250716 | h5.3.1.3250:build_20250912 | h5.3.1.3292:build_20251024
Qnap systems inc.1 product
  • quts hero≥ h5.3.x, < h5.3.2.3354 build 20251225

2 vendors · 2 products

References

1 links