CVE-2018-19943 HIGH

CVE-2018-19943

Vendor Qnap Systems Inc.
Product QTS
Weakness CWE-79 · XSS
KEV Status Known Exploited
Ransomware Used in campaigns
Published October 28, 2020
Last update October 21, 2025

CVSS base score

8.0/10
Attack vector Network
Attack complexity High
Privileges required Low
User interaction Required
Confidentiality High
Integrity High

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H

What the vulnerability does

01Description

If exploited, this cross-site scripting vulnerability could allow remote attackers to inject malicious code. QNAP has already fixed these issues in the following QTS versions. QTS 4.4.2.1270 build 20200410 and later QTS 4.4.1.1261 build 20200330 and later QTS 4.3.6.1263 build 20200330 and later QTS 4.3.4.1282 build 20200408 and later QTS 4.3.3.1252 build 20200409 and later QTS 4.2.6 build 20200421 and later

CISA mandated remediation

02CISA Required Action

Apply updates per vendor instructions.

Key dates

03Disclosure timeline

October 28, 2020 CVE published
October 21, 2025 Record updated

Related vulnerabilities

05Related CVE