CVE-2018-19953

Q: How do I fix CVE-2018-19953?

Upgrade qts to 4.4.2.1231 or later.

Q: Is CVE-2018-19953 being actively exploited?

Yes. CVE-2018-19953 is listed in the CISA Known Exploited Vulnerabilities catalog, which means exploitation has been observed in the wild. CISA has also linked it to known ransomware campaigns. US federal agencies were required to remediate it by 2022-06-14. Treat it as a priority whatever its CVSS score says.

Q: How severe is CVE-2018-19953?

CVE-2018-19953 has a CVSS v3 base score of 6.1, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

Q: What does CVE-2018-19953 affect?

Published advisories record a fix for qts (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

MEDIUMCISA KEVEPSS 98th pctl

6.1

CVSS v3

NVD

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.

CWE-79Cross-Site Scripting (XSS)CWE-80

How to fix

Remediation Available

qtsNVD

Affected:>= 4.4.2, < 4.4.2.1231Fixed in:4.4.2.1231CVE-2018-19953derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeChanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityNone

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

Exploit Intelligence

23.89%probability of exploitation in 30 days

98thpercentile

Very high risk: more likely to be exploited than 98% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

QNAP NAS File Station Cross-Site Scripting Vulnerability

A cross-site scripting vulnerability affecting QNAP NAS File Station could allow remote attackers to inject malicious code.

Apply updates per vendor instructions.

Remediation due: 2022-06-14

Associated with ransomware campaigns

References

Vendor Advisory1

qnap.com

Government Resource1

cisa.gov

Related Vulnerabilities

Other CWE-79 (Cross-Site Scripting (XSS)) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2018-12998	Medium	6.1	99%	-	-
CVE-2020-11022	Medium	6.9	99%	-	Fix
CVE-2019-3929	Critical	9.8	99%	KEV	Fix
CVE-2020-9496	Medium	6.1	99%	-	-
CVE-2023-28341	Medium	6.1	99%	-	Fix
CVE-2025-4123	High	7.6	98%	-	Fix

Common questions

How do I fix CVE-2018-19953?

Upgrade qts to 4.4.2.1231 or later.

Is CVE-2018-19953 being actively exploited?

Yes. CVE-2018-19953 is listed in the CISA Known Exploited Vulnerabilities catalog, which means exploitation has been observed in the wild. CISA has also linked it to known ransomware campaigns. US federal agencies were required to remediate it by 2022-06-14. Treat it as a priority whatever its CVSS score says.

How severe is CVE-2018-19953?

CVE-2018-19953 has a CVSS v3 base score of 6.1, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2018-19953 affect?

Published advisories record a fix for qts (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-11-03.