CVE-2018-19943

Name: CVE-2018-19943
Creator: NVD / NIST
Published: 2020-10-28T18:15:12.52+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.4/10Actively ExploitedEPSS 17.71%

Last modified Jun 17, 2026

CVE-2018-19943 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. 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. CISA has confirmed active exploitation in the wild. EPSS estimates a 17.71% chance of exploitation in the next 30 days.

Description

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

Metrics

CVSS 3.1

5.4/10

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

EPSS Probability

17.71%

96.8th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by Jun 14, 2022.

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Qnap	Qts	< 4.2.6
Qnap	Qts	>= 4.3.1.0013, < 4.3.3.1252
Qnap	Qts	>= 4.3.4, < 4.3.4.1282
Qnap	Qts	>= 4.3.6, < 4.3.6.1263
Qnap	Qts	>= 4.4.0, < 4.4.1.1261
Qnap	Qts	>= 4.4.2, < 4.4.2.1270
Qnap	Qts	4.2.6

References

https://www.qnap.com/zh-tw/security-advisory/qsa-20-01Vendor Advisory
https://www.qnap.com/zh-tw/security-advisory/qsa-20-01Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-19943US Government Resource

Timeline

Published: Oct 28, 2020
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2018-19943?

How severe is CVE-2018-19943?

CVE-2018-19943 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 17.71% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2018-19943?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-19943?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST