Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2025-66280

Severity CVSS v4.0:
MEDIUM
Type:
CWE-121 Stack-based Buffer Overflow
Publication date:
10/06/2026
Last modified:
15/06/2026

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.<br /> <br /> We have already fixed the vulnerability in the following versions:<br /> QTS 5.2.9.3410 build 20260214 and later<br /> QuTS hero h5.2.9.3410 build 20260214 and later<br /> QuTS hero h5.3.4.3500 build 20260520 and later<br /> QuTS hero h6.0.0.3397 build 20260206 and later

Impact

Vector 4.0
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 CVSS v4.0 Severity and Metrics:

Base Score: 5.10 MEDIUM
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

Attack Vector (AV): Network
Attack Complexity (AC): Low
Attack Requirements (AT): None
Privileges Required (PR): High
User Interaction (UI): None
Confidentiality (VC): None
Integrity (VI): Low
Availability (VA): Low
Confidentiality (SC): None
Integrity (SI): None
Availability (SA): None

Base Score 4.0
5.10
Severity 4.0
MEDIUM
Vector 3.x
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H CVSS v3.1 Severity and Metrics:

Base Score: 7.20 HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): High
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): High
Availability (A): High

Base Score 3.x
7.20
Severity 3.x
HIGH

Vulnerable products and versions

CPE From Up to
cpe:2.3:o:qnap:qts:*:*:*:*:*:*:*:* 5.2.0.2737 (including) 5.2.9.3410 (excluding)
cpe:2.3:o:qnap:quts_hero:*:*:*:*:*:*:*:* h5.2.0.2737 (including) h5.2.9.3410 (excluding)
cpe:2.3:o:qnap:quts_hero:*:*:*:*:*:*:*:* h5.3.0.3115 (including) h5.3.4.3500 (excluding)
cpe:2.3:o:qnap:quts_hero:*:*:*:*:*:*:*:* h6.0.0.3324 (including) h6.0.0.3397 (excluding)

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools