No exploitation reportedFix available

CVE-2018-19945

Q: Is CVE-2018-19945 actively exploited?

Active exploitation of CVE-2018-19945 has not been confirmed. Its EPSS score was 1.1% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2018-19945?

CVE-2018-19945 has a CVSS v3 base score of 9.1 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H.

No exploitation reported by the sources we read.

Published2020-12-31
Fixed in4.3.6.0895 · 4.3.4.0899
WeaknessCWE-20 · CWE-22 · CWE-284

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC

2020-12-3117:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2018-19945?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2018-19945?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Qnap qts

Branch	Affected	Fixed in	Source
4.3	≥ 4.3.5, < 4.3.6.0895	4.3.6.0895	NVD
4.3	≥ 4.3.4, < 4.3.4.0899	4.3.4.0899	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update Qnap qts to 4.3.6.0895 · 4.3.4.0899

Advisories and patches

www.qnap.comVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.19.1read 2026-10-23
NVDCVSS 2.08.5read 2026-10-23
CNAweakness (CWE)CWE-20, CWE-22, CWE-284, CWE-73read 2026-10-23
NVDweakness (CWE)CWE-22read 2026-10-23
FIRST EPSSEPSS score1.1 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Published: 2020-12-31
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2018-19945?

Is CVE-2018-19945 actively exploited?

Active exploitation of CVE-2018-19945 has not been confirmed. Its EPSS score was 1.1% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2018-19945?

CVE-2018-19945 has a CVSS v3 base score of 9.1 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H.

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