Buffer overflow in Qnap Qts
CVE-2025-66280
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…
Vulnerability class: Buffer Overflow
EPSS: 0.004 (35.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Qnap Qts
- Qnap Quts_hero
- Qnap Systems Inc. Qts — versions 5.2.0
- Qnap Systems Inc. Quts Hero — versions h5.2.0, h5.3.0, ?
Weakness classification (CWE)
References
- security@qnapsecurity.com.tw (Broken Link, Vendor Advisory)
Frequently asked questions
- What is CVE-2025-66280?
- CVE-2025-66280 is a high-severity vulnerability in Qnap Qts, classified under Stack-based Buffer Overflow. CVSS score: 7.2/10. Published 2026-06-10.
- How severe is CVE-2025-66280?
- High severity. CVSS v3 base score is 7.2 out of 10.