CVE-2025-59386Network attack vector

Denial of service via NULL pointer dereference

Published Feb 11, 2026 · Updated Feb 11, 2026

NULL pointer dereference in QNAP QuTS hero before h5.3.2.3354 build 20251225 allows remote authenticated users to cause denial of service. QNAP has not published the affected component, request path, or input that reaches the NULL pointer dereference. Exploitation requires an administrator account; the reported consequence is service interruption, with no confidentiality or integrity impact.

CVSS severity4.9
Medium
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in QNAP QuTS hero before h5.3.2.3354 build 20251225 allows remote authenticated users to cause denial of service. QNAP has not published the affected component, request path, or input that reaches the NULL pointer dereference. Exploitation requires an administrator account; the reported consequence is service interruption, with no confidentiality or integrity impact.

The record

CVE
CVE-2025-59386
Published
Feb 11, 2026
Updated
Feb 11, 2026
Vendor
Linn Products Limited
Product
QuTS hero
Classifications
CWE-476, CAPEC-129, T1499.004
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Feb 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=h5.3.x <h5.3.2.3354 build 20251225

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Linn Products Limited · QuTS heroversion=h5.3.x <h5.3.2.3354 build 20251225

Published CVSS scores

4.9NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
1.2QNAP Systems, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
CAPEC-129Pointer Manipulation
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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