CISA KEV · Known exploitedMedium

CVE-2018-19953

QNAP Network Attached Storage (NAS)

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.

CVSS: 6.1
EPSS: 23.9%
CISA KEV: Listed
Published: 2020.10.29

PRIORITY ASSESSMENT

Immediate review

CISA has listed this vulnerability in the Known Exploited Vulnerabilities catalog.

Known exploitationConfirmed by CISA KEV

Exploit probability23.9%

Technical severityCVSS 6.1

Vulnerability overview

Affected product and versions

Product: QNAP Network Attached Storage (NAS)
Affected versions: unspecified, < 4.2.6, >= 4.3.1.0013 < 4.3.3.1161, >= 4.3.4 < 4.3.4.1190, >= 4.3.6 < 4.3.6.1218, >= 4.4.0 < 4.4.1.1201, >= 4.4.2 < 4.4.2.1231, 4.2.6
Fixed versions: 4.2.6, 4.3.3.1161, 4.3.4.1190, 4.3.6.1218, 4.4.1.1201, 4.4.2.1231

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

CISA required action

Apply updates per vendor instructions.

Due date: 2022.06.14

1
Identify
Confirm that QNAP Network Attached Storage (NAS) and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CWE: CWE-79, CWE-80
KEV added: 2022.05.24
Ransomware use: 확인됨