An integer overflow or wraparound 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 compromise the security of the system.

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

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Advisories

No advisories yet.

Fixes

Solution

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


Workaround

No workaround given by the vendor.

History

Wed, 10 Jun 2026 16:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 10 Jun 2026 07:45:00 +0000

Type Values Removed Values Added
First Time appeared Qnap Systems
Qnap Systems qts
Qnap Systems quts Hero
Vendors & Products Qnap Systems
Qnap Systems qts
Qnap Systems quts Hero

Wed, 10 Jun 2026 03:45:00 +0000

Type Values Removed Values Added
Description An integer overflow or wraparound 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 compromise the security of the system. 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
Title QTS, QuTS hero
Weaknesses CWE-121
CWE-190
References
Metrics cvssV4_0

{'score': 5.1, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: qnap

Published:

Updated: 2026-06-10T15:52:04.680Z

Reserved: 2025-11-26T09:25:37.833Z

Link: CVE-2025-66280

cve-icon Vulnrichment

Updated: 2026-06-10T15:51:59.966Z

cve-icon NVD

Status : Received

Published: 2026-06-10T04:17:12.420

Modified: 2026-06-10T04:17:12.420

Link: CVE-2025-66280

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-06-10T07:30:24Z

Weaknesses