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CVE-2025-62858

QTS, QuTS hero

MEDIUM
6.5
CVSS Score
Published: June 9, 2026 at 06:17 AM UTC
Updated: July 23, 2026 at 07:32 PM UTC
2 products affected across 1 vendorQTSQuTS hero

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Severity
MEDIUM6.5
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

Description

A buffer overflow 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 modify memory or crash processes. We have already fixed the vulnerability in the following versions: QTS 5.2.9.3410 build 20260214 and later QuTS hero h5.2.9.3410 build 20260214 and later QuTS hero h5.3.4.3500 build 20260520 and later QuTS hero h6.0.0.3397 build 20260206 and later

Affected

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

QTS· Qnap
95%
5.2.0 ≤ v < 5.2.9.3410 build 202602145.2.05.2.0.2737 build_202404175.2.0.2744 build_202404245.2.0.2782 build_202406015.2.0.2802 build_202406205.2.0.2823 build_202407115.2.0.2851 build_202408085.2.0.2860 build_202408175.2.1.2930 build_202410255.2.2.2950 build_202411145.2.3.3006 build_202501085.2.4.3070 build_202503125.2.4.3079 build_202503215.2.4.3092 build_202504035.2.5.3145 build_202505265.2.6.3195 build_202507155.2.6.3229 build_202508185.2.7.3256 build_202509135.2.7.3297 build_202510245.2.8.3332 build_202511285.2.8.3350 build_202512165.2.8.3359 build_20251225
Affected range stops below 5.2.9.3410 build 20260214, so it looks safe — our inference, not a vendor statement
QuTS hero· Qnap
95%
? ≤ v < h6.0.0.3397 build 20260206h5.2.0 ≤ v < h5.2.9.3410 build 20260214h5.3.0 ≤ v < h5.3.4.3500 build 20260520?h5.2.0h5.2.0.2737 build_20240417h5.2.0.2782 build_20240601h5.2.0.2789 build_20240607h5.2.0.2802 build_20240620h5.2.0.2823 build_20240711h5.2.0.2851 build_20240808h5.2.0.2860 build_20240817h5.2.1.2929 build_20241025h5.2.1.2940 build_20241105h5.2.2.2952 build_20241116h5.2.3.3006 build_20250108h5.2.4.3070 build_20250312h5.2.4.3079 build_20250321h5.2.5.3138 build_20250519h5.2.6.3195 build_20250715h5.2.7.3256 build_20250913h5.2.7.3297 build_20251024h5.2.8.3321 build_20251117h5.2.8.3350 build_20251216h5.2.8.3359 build_20251225h5.3.0h5.3.0.3115 build_20250430h5.3.0.3145 build_20250530h5.3.0.3192 build_20250716h5.3.1.3250 build_20250912h5.3.1.3292 build_20251024h5.3.2.3354 build_20251225h5.3.3.3424 build_20260305h6.0.0.3324 build_20251125h6.0.0.3382 build_20260122
Affected range stops below h5.2.9.3410 build 20260214, so it looks safe — our inference, not a vendor statement
Affected range stops below h5.3.4.3500 build 20260520, so it looks safe — our inference, not a vendor statement
Affected range stops below h6.0.0.3397 build 20260206, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

Broken Link
Source: cverecord
https://www.qnap.com/en/security-advisory/qsa-26-10

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

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

CVSS

6.5MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-121

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