CVE-2025-66280

QTS, QuTS hero

HIGH

7.2

CVSS Score

Published: June 10, 2026 at 03:05 AM UTC

Updated: July 23, 2026 at 07:32 PM UTC

2 products affected across 1 vendorQTSQuTS hero

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Severity

HIGH7.2

Exploit prediction

EPSS 0.4%

SSVC

No known exploit

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

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 202602145.2.0.2737 ≤ v < 5.2.9.34105.2.0

Affected range stops below 5.2.9.3410, so it looks safe — our inference, not a vendor statement

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 20260214h5.2.0.2737 ≤ v < h5.2.9.3410h5.3.0 ≤ v < h5.3.4.3500 build 20260520h5.3.0.3115 ≤ v < h5.3.4.3500h6.0.0.3324 ≤ v < h6.0.0.3397?h5.2.0 h5.3.0

Affected range stops below h5.2.9.3410, so it looks safe — our inference, not a vendor statement

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, 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, 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. What the record does show:

Patch and advisory references

https://www.qnap.com/en/security-advisory/qsa-26-10

References (1)

Broken LinkVendor Advisory

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

7.2HIGH[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: HIGH
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: HIGH
Availability: HIGH

Vector?

Quick Info

StatusANALYZED

CWE

CWE-190CWE-121

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