PT-2026-48362 · Qnap Systems · Qts+1

Published 2026-06-10 · Updated 2026-06-10 · CVE-2025-66280

Mitre

CVSS v4.0

5.1

Medium

Base vector

AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N

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

Fix

Integer Overflow

Stack Overflow

Weakness Enumeration

CWE-190

CWE-121

Related Identifiers

CVE-2025-66280

Affected Products

Qts

Quts Hero

References · 2

• https://nvd.nist.gov/vuln/detail/CVE-2025-66280 · Security Note
• https://qnap.com/en/security-advisory/qsa-26-10 · Note