Is CVE-2018-19953 in the CISA KEV catalog?

Yes. CVE-2018-19953 is on the CISA Known Exploited Vulnerabilities list, added 2022-05-24, and has known ransomware campaign use.

What is the CVSS severity of CVE-2018-19953?

CVE-2018-19953 has a CVSS v3 base score of 6.1 (MEDIUM).

What is the EPSS score for CVE-2018-19953?

CVE-2018-19953 has an EPSS score of 23.89% (98th percentile), estimating the probability of exploitation in the next 30 days.

CVE & CISA-KEV Catalog

CVE-2018-19953

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

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

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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.