CVE record · CVE-2018-19943

Cross-site scripting in QNAP Systems Inc. QTS

CVSS 8.0 HighCriticalIn CISA KEV · ransomwareEPSS 0.23 · 97th percentile

Critical, because:

In CISA’s KEV catalogue since 24 May 2022: it is known to be exploited.
CVSS score 8.0 (7.0 or more) and EPSS 0.23 (0.1 or more): a high score and a real chance of exploitation in the next 30 days.

Published by the CVE Program (CNA: qnap) at 28 Oct 2020, 17:55 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
QNAP Systems Inc.	QTS	affected unspecified to before 4.4.2.1270 custom
QNAP Systems Inc.	QTS	affected unspecified to before 4.4.1.1261 custom affected unspecified to before 4.3.6.1263 custom
QNAP Systems Inc.	QTS	affected unspecified to before 4.3.4.1282 custom
QNAP Systems Inc.	QTS	affected unspecified to before 4.3.3.1252 custom
QNAP Systems Inc.	QTS	affected unspecified to before 4.2.6 custom

Identifiers: CVE-2018-19943
CNA: qnap
Weakness (CWE): CWE-79 · CWE-80
Tags: QNAP Systems Inc. QTS
Cross-site scripting (XSS)
Published: 28 Oct 2020
Updated: 13 Aug 2026

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
8.0	High	3.1	CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H	CNA (qnap)

CISA KEV Listed since 24 May 2022: known to be exploited. CISA reports use in ransomware campaigns.
EPSS 0.23, the 97th percentile, on 7 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 28 Oct 2020. New records show when each source confirmed them.

Sources

References from the CNA

www.qnap.com/zh-tw/security-advisory/qsa-20-01

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.