What is the CVSS score of CVE-2025-59386?

CVE-2025-59386 has a CVSS 3.1 base score of 4.9 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H. EPSS exploitation probability: 0.1%.

How to fix or mitigate CVE-2025-59386?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.

Quts Hero CVE-2025-59386

MEDIUM

NULL Pointer Dereference (CWE-476)

2026-02-11 security@qnapsecurity.com.tw

Null Pointer Dereference Qnap Quts Hero

4.9

CVSS 3.1 · NVD

View

Vulnerability Assessment

Weakness	CWE CWE-476 OWASP Top 10:2025 A10:2025 - Mishandling of Exceptional Conditions ASVS 5.0 V16 - Security Logging and Error Handling Null pointer safety, defensive checks MITRE ATT&CK 1 technique across 1 tactic: Impact The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Impact	CVSS 4.9 (MEDIUM). Attack vector: Network. Complexity: Low. Privileges required: High. User interaction: None. Exploitation requires authentication. Exploitable via remote/network.
Exploit ScenarioDerived	A remote attacker (requires authentication) could exploit this vulnerability to compromise the affected system.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).

No patch listed yet 0.1% exploitation probability (EPSS)

Get an e-mail when this CVE is exploited, patched or re-scored. Free account.

Alert me

AnalysisAIv1 – Mar 12, 2026

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. [CVSS 4.9 MEDIUM]

RemediationAI

Monitor vendor advisories for a patch. Restrict network access to the affected service where possible.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

Classified as CWE-476 (NULL Pointer Dereference). Affects Quts Hero. 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

Know when Quts Hero gets its next vulnerability

Watch products and get an email when something new is published
Check this CVE against your own stack and servers
Exploit and PoC references, threat intelligence from 22 sources

Continue with Google Continue with GitHub

No credit card · 7-day full trial

Severity by source

NVD PRIMARY 4.9 MEDIUM

AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

DescriptionCVE.org

We have already fixed the vulnerability in the following version: QuTS hero h5.3.2.3354 build 20251225 and later

Executive ViewAI

Why It Matters

Organizations using A NULL pointer dereference vulnerability should be aware of moderate risk from CVE-2025-59386, a null pointer dereference vulnerability rated CVSS 4.9. Exploitation could compromise the security of affected deployments. Organizations should apply vendor updates when available and monitor for exploitation.

Business Impact: Low

Compensating Controls

Apply vendor patch. If patching is delayed: enable ASLR/DEP, apply network segmentation.

Threat Intelligence Overview

EPSS Score

0.1%

Top 68% exploitable

Data Quality

3 sources

Confidence: Low

NVD

CVE.org

EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity MEDIUM

CISA KEV No

Public POC No

EPSS 0.1%

Patch available No

Active threat No

Deciding rule

MEDIUM severity (CVSS 4.0-6.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Defer

Exploitation· derived

None

System Exposure· derived

Open

Automatable· derived

Human Impact

Low

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +24

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Null Pointer Dereference MEDIUM

A null pointer dereference occurs when a program attempts to access memory through a pointer that has been set to NULL (address 0x0).

Affected Products (CPE)CVE.org

cpe:2.3:o:qnap:quts_hero:h5.3.0.3115:build_20250430:*:*:*:*:*:*

cpe:2.3:o:qnap:quts_hero:h5.3.0.3145:build_20250530:*:*:*:*:*:*

cpe:2.3:o:qnap:quts_hero:h5.3.0.3192:build_20250716:*:*:*:*:*:*

cpe:2.3:o:qnap:quts_hero:h5.3.1.3250:build_20250912:*:*:*:*:*:*

cpe:2.3:o:qnap:quts_hero:h5.3.1.3292:build_20251024:*:*:*:*:*:*

More in Quts Hero

View all

CVE-2023-39296 HIGH This Week POC

7.5 Jan 05

A prototype pollution vulnerability has been reported to affect several QNAP operating system versions. Rated high sever

CVE-2024-32766 CRITICAL Act Now

10.0 Apr 26

An OS command injection vulnerability has been reported to affect several QNAP operating system versions. Rated critical

CVE-2025-66277 CRITICAL Act Now

9.8 Feb 11

Symlink following vulnerability in multiple QNAP NAS operating system versions allows remote attackers to exploit link r

CVE-2024-21899 CRITICAL Act Now POC

9.8 Mar 08

An improper authentication vulnerability has been reported to affect several QNAP operating system versions. Rated criti

CVE-2023-23368 CRITICAL Act Now

9.8 Nov 03

An OS command injection vulnerability has been reported to affect several QNAP operating system versions. Rated critical

CVE-2021-28804 CRITICAL Act Now

9.8 Jul 01

A command injection vulnerabilities have been reported to affect QTS and QuTS hero. Rated critical severity (CVSS 9.8),

CVE-2021-28802 CRITICAL Act Now

9.8 Jul 01

A command injection vulnerabilities have been reported to affect QTS and QuTS hero. Rated critical severity (CVSS 9.8),

CVE-2025-66276 CRITICAL Act Now

9.2 Jun 10

High-severity information disclosure flaw in QNAP QTS NAS operating system versions 5.2.0 through 5.2.7.3256 build 20250

CVE-2025-22481 HIGH This Week

8.8 Jun 06

Command injection vulnerability affecting QNAP NAS operating systems (QTS and QuTS hero) that allows authenticated remot

CVE-2024-21898 HIGH This Week

8.8 Sep 06

An OS command injection vulnerability has been reported to affect several QNAP operating system versions. Rated high sev

CVE-2024-27130 HIGH This Week

8.8 May 21

A buffer copy without checking size of input vulnerability has been reported to affect several QNAP operating system ver

CVE-2024-27129 HIGH This Week

8.8 May 21

A buffer copy without checking size of input vulnerability has been reported to affect several QNAP operating system ver

Same weakness CWE-476 – NULL Pointer Dereference

View all

CVE-2016-0742 HIGH

7.5

CVE-2014-3470 MEDIUM

4.3

CVE-2020-1967 HIGH POC

7.5

CVE-2017-3730 HIGH POC

7.5

CVE-2017-3169 CRITICAL POC

9.8

CVE-2016-4957 HIGH

7.5

CVE-2021-3449 MEDIUM

5.9

CVE-2015-3194 HIGH

7.5

References

Advisories & patches

ADVISORY https://www.qnap.com/en/security-advisory/qsa-26-08

Search Externally

GitHub PoC

Exploit-DB PacketStorm Snyk Rapid7 Nuclei Templates Trickest PoC

Back