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CVE-2025-53405

QTS, QuTS hero

MEDIUM
4.9
CVSS Score
Published: January 2, 2026 at 02:54 PM UTC
Updated: October 14, 2026 at 07:10 PM UTC
2 products affected across 1 vendorQTSQuTS hero

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Severity
MEDIUM4.9
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

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 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

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

QTS· Qnap
95%
5.2.0.27375.2.0.2737 build_202404175.2.0.27445.2.0.2744 build_202404245.2.0.27825.2.0.2782 build_202406015.2.0.28025.2.0.2802 build_202406205.2.0.28235.2.0.2823 build_202407115.2.0.28515.2.0.2851 build_202408085.2.0.28605.2.0.2860 build_202408175.2.1.29305.2.1.2930 build_202410255.2.2.29505.2.2.2950 build_202411145.2.3.30065.2.3.3006 build_202501085.2.4.30705.2.4.3070 build_202503125.2.4.30795.2.4.3079 build_202503215.2.4.30925.2.4.3092 build_202504035.2.5.31455.2.5.3145 build_202505265.2.6.31955.2.6.3195 build_202507155.2.6.32295.2.6.3229 build_202508185.2.x
Affected range stops below 5.2.7.3256 build 20250913, so it looks safe — our inference, not a vendor statement
QuTS hero· Qnap
95%
h5.2.0.2737h5.2.0.2737 build_20240417h5.2.0.2782h5.2.0.2782 build_20240601h5.2.0.2789h5.2.0.2789 build_20240607h5.2.0.2802h5.2.0.2802 build_20240620h5.2.0.2823h5.2.0.2823 build_20240711h5.2.0.2851h5.2.0.2851 build_20240808h5.2.0.2860h5.2.0.2860 build_20240817h5.2.1.2929h5.2.1.2929 build_20241025h5.2.1.2940h5.2.1.2940 build_20241105h5.2.2.2952h5.2.2.2952 build_20241116h5.2.3.3006h5.2.3.3006 build_20250108h5.2.4.3070h5.2.4.3070 build_20250312h5.2.4.3079h5.2.4.3079 build_20250321h5.2.5.3138h5.2.5.3138 build_20250519h5.2.6.3195h5.2.6.3195 build_20250715h5.2.xh5.3.0.3115h5.3.0.3115 build_20250430h5.3.0.3145h5.3.0.3145 build_20250530h5.3.0.3192h5.3.0.3192 build_20250716h5.3.x
Affected range stops below h5.2.7.3256 build 20250913, so it looks safe — our inference, not a vendor statement
Affected range stops below h5.3.1.3250 build 20250912, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor Advisory
Source: cverecord
https://www.qnap.com/en/security-advisory/qsa-25-50

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

4.9MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-476

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