CVE-2018-19953

Name: CVE-2018-19953
Creator: NVD / NIST
Published: 2020-10-28T18:15:12.74+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10Actively ExploitedEPSS 23.89%

Last modified Jun 17, 2026

CVE-2018-19953 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. If exploited, this cross-site scripting vulnerability could allow remote attackers to inject malicious code. QNAP has already fixed the issue in the following QTS versions. CISA has confirmed active exploitation in the wild. EPSS estimates a 23.89% 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 the issue in the following QTS versions. QTS 4.4.2.1231 on build 20200302; QTS 4.4.1.1201 on build 20200130; QTS 4.3.6.1218 on build 20200214; QTS 4.3.4.1190 on build 20200107; QTS 4.3.3.1161 on build 20200109; QTS 4.2.6 on build 20200109.

Metrics

CVSS 3.1

6.1/10

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

EPSS Probability

23.89%

97.5th 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, < 4.3.3.1161
Qnap	Qts	>= 4.3.4, < 4.3.4.1190
Qnap	Qts	>= 4.3.6, < 4.3.6.1218
Qnap	Qts	>= 4.4.0, < 4.4.1.1201
Qnap	Qts	>= 4.4.2, < 4.4.2.1231
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-2018-19953US Government Resource

Timeline

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

Frequently Asked Questions

What is CVE-2018-19953?

How severe is CVE-2018-19953?

CVE-2018-19953 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 23.89% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2018-19953?

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-2018-19953?

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

Scan your code now

Source: NVD / NIST