What is CVE-2023-45039?

CVE-2023-45039 is a low-severity vulnerability in QNAP Qts, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 3.8/10. Published 2024-01-05.

How severe is CVE-2023-45039?

Low severity. CVSS v3 base score is 3.8 out of 10.

Buffer overflow in QNAP Qts

CVE-2023-45039

A buffer copy without checking size of input vulnerability has been reported to affect several QNAP operating system versions. If exploited, the vulnerability could allow authenticated administrators to execute code via a network. We have already fixed the vulnerability in the following versions: QTS 5.1.4.2596 build 20231128 and later QuTS hero h5.1.4.2596 build 20231128 and later

Vulnerability class: Buffer Overflow

Published 2024-01-05 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 3.8 (Low). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:L.

EPSS exploit prediction

EPSS: 0.006 (48.7th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 48.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

QNAP Qts — versions 5.1.0.2348, 5.1.0.2399, 5.1.0.2418
QNAP Quts Hero — versions h5.1.0.2409, h5.1.0.2424, h5.1.0.2453
QNAP Systems Inc. Qts — versions 5.1.x
QNAP Systems Inc. Quts Hero — versions h5.1.x

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

References

www.qnap.com/en/security-advisory/qsa-23-27 (Vendor Advisory)

Frequently asked questions

What is CVE-2023-45039?: CVE-2023-45039 is a low-severity vulnerability in QNAP Qts, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 3.8/10. Published 2024-01-05.
How severe is CVE-2023-45039?: Low severity. CVSS v3 base score is 3.8 out of 10.