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CISA KEV · Known exploitedMedium

CVE-2018-19943

QNAP Network Attached Storage (NAS)

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

CVSS
5.4
EPSS
17.7%
96.9% percentile
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 probability17.7%
Technical severityCVSS 5.4

Vulnerability overview

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

Affected product and versions

Product
QNAP Network Attached Storage (NAS)
Affected versions
unspecified, < 4.2.6, >= 4.3.1.0013 < 4.3.3.1252, >= 4.3.4 < 4.3.4.1282, >= 4.3.6 < 4.3.6.1263, >= 4.4.0 < 4.4.1.1261, >= 4.4.2 < 4.4.2.1270, 4.2.6
Fixed versions
4.2.6, 4.3.3.1252, 4.3.4.1282, 4.3.6.1263, 4.4.1.1261, 4.4.2.1270

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. 1
    Identify

    Confirm that QNAP Network Attached Storage (NAS) and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

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