Buffer overflow in Qnap Qts
CVE-2025-48721
A buffer overflow 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 modify memory or crash processes. We have already fixed the vulnerability in the following version: QTS 5.2.8.3332 build 20251128 and later
Vulnerability class: Buffer Overflow
EPSS: 0.004 (31.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H.
Affected products
- Qnap Qts — versions 5.2.0.2737, 5.2.0.2744, 5.2.0.2782
- Qnap Quts_hero — versions h5.2.0.2737, h5.2.0.2782, h5.2.0.2789
- Qnap Systems Inc. Qts — versions 5.2.x
Weakness classification (CWE)
References
- security@qnapsecurity.com.tw (Vendor Advisory)
Frequently asked questions
- What is CVE-2025-48721?
- CVE-2025-48721 is a medium-severity vulnerability in Qnap Qts, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 6.5/10. Published 2026-01-02.
- How severe is CVE-2025-48721?
- Medium severity. CVSS v3 base score is 6.5 out of 10.