What is CVE-2018-19945?

CVE-2018-19945 is a critical-severity vulnerability in QNAP Qts, classified under Improper Input Validation. CVSS score: 9.1/10. Published 2020-12-31.

How severe is CVE-2018-19945?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Path Traversal in QNAP Qts

CVE-2018-19945

A vulnerability has been reported to affect earlier QNAP devices running QTS 4.3.4 to 4.3.6. Caused by improper limitations of a pathname to a restricted directory, this vulnerability allows for renaming arbitrary files on the target system, if exploited. QNAP have already fixed this vulnerability in the following versions: QTS 4.3.6.0895 build 20190328 (and later) QTS 4.3.4.0899 build 20190322 (and later) This issue does not affect QTS 4.4.x or QTS 4.5.x.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2020-12-31 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H.

EPSS exploit prediction

EPSS: 0.011 (64.9th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 65th percentile — 64.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: +0.000

Affected products

QNAP Qts
QNAP Systems Inc. Qts — versions 4.5.x, unspecified, 4.4.x

Weakness classification (CWE)

References

www.qnap.com/zh-tw/security-advisory/qsa-20-21 (Vendor Advisory)

Frequently asked questions

What is CVE-2018-19945?: CVE-2018-19945 is a critical-severity vulnerability in QNAP Qts, classified under Improper Input Validation. CVSS score: 9.1/10. Published 2020-12-31.
How severe is CVE-2018-19945?: Critical severity. CVSS v3 base score is 9.1 out of 10.