What is CVE-2025-62858?

CVE-2025-62858 is a medium-severity vulnerability in Qnap Qts, classified under Stack-based Buffer Overflow. CVSS score: 6.5/10. Published 2026-06-09.

How severe is CVE-2025-62858?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Buffer overflow in Qnap Qts

CVE-2025-62858

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…

Vulnerability class: Buffer Overflow

EPSS: 0.004 (36.4th 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 5.2.0
Qnap Systems Inc. Quts Hero — versions h5.2.0, h5.3.0, ?

Weakness classification (CWE)

CWE-121 — Stack-based Buffer Overflow

References

security@qnapsecurity.com.tw (Broken Link)

Frequently asked questions

What is CVE-2025-62858?: CVE-2025-62858 is a medium-severity vulnerability in Qnap Qts, classified under Stack-based Buffer Overflow. CVSS score: 6.5/10. Published 2026-06-09.
How severe is CVE-2025-62858?: Medium severity. CVSS v3 base score is 6.5 out of 10.