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ExploitedIn CISA KEVFix available

CVE-2018-19953

Exploitation confirmed. First attested on 2022-05-24 by CISA-ADP, CISA KEV, GCVE · kevintel.

  • Published2020-10-28
  • Fixed in4.4.2.1231 · 4.4.1.1201 · 4.3.6.1218 · 4.3.4.1190 · 4.3.3.1161 · 4.2.6
  • WeaknessCWE-79 · CWE-80

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2020-10-2818:15CVE publishedNVD
  2. 2022-05-24Added to the CISA KEV catalogCISA KEV
  3. 2022-05-24Listed as exploited by GCVEGCVE
  4. 2022-05-24Exploitation first reportedCISA KEV
  5. 2026-08-1303:55SSVC exploitation set to activeCISA-ADP

Observed activity

isMalicious corpus · updated 2026-11-03 15:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2018-19953?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2018-19953?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Qnap qts
BranchAffectedFixed in
4.4≥ 4.4.2, < 4.4.2.12314.4.2.1231
4.4≥ 4.4.0, < 4.4.1.12014.4.1.1201
4.3≥ 4.3.6, < 4.3.6.12184.3.6.1218
4.3≥ 4.3.4, < 4.3.4.11904.3.4.1190
4.3≥ 4.3.1.0013, < 4.3.3.11614.3.3.1161
4.2< 4.2.64.2.6
4.2= 4.2.6no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA5 products

As qnap, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • QNAP Systems Inc. QTS

    platforms: build 20200302

    Affected
    • < 4.4.2.1231fixed in 4.4.2.1231custom
  • QNAP Systems Inc. QTS

    platforms: build 20200130

    Affected
    • < 4.4.1.1201fixed in 4.4.1.1201custom
  • QNAP Systems Inc. QTS

    platforms: build 20200214

    Affected
    • < 4.3.6.1218fixed in 4.3.6.1218custom
  • QNAP Systems Inc. QTS

    platforms: build 20200107

    Affected
    • < 4.3.4.1190fixed in 4.3.4.1190custom
  • QNAP Systems Inc. QTS

    platforms: build 20200109

    Affected
    • < 4.3.3.1161fixed in 4.3.3.1161custom
    • < 4.2.6fixed in 4.2.6custom

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2020-10-28

Fix

  1. Update Qnap qts to 4.4.2.1231 · 4.4.1.1201 · 4.3.6.1218 · 4.3.4.1190 · 4.3.3.1161 · 4.2.6
  2. CISA’s required action: Apply updates per vendor instructions.due 2022-06-14

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

CISA Known Exploited Vulnerability

Date Added
2022-05-24
Patch Due Date
2022-06-14
Ransomware Use
Known
Required Action
Apply updates per vendor instructions.

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Published
2020-10-28
Last Modified
2026-10-01
NVD status
Analyzed
GitHub Advisory
GHSA-8h8x-7j55-4jp9

Frequently asked questions

What is CVE-2018-19953?

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.

Is CVE-2018-19953 actively exploited?

Yes. CVE-2018-19953 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2022-06-14.

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

CVE-2018-19953 has a CVSS v3 base score of 6.1 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

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