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ExploitedIn CISA KEVFix available

CVE-2018-19943

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

  • Published2020-10-28
  • Fixed in4.4.2.1270 · 4.4.1.1261 · 4.3.6.1263 · 4.3.4.1282 · 4.3.3.1252 · 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 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

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. 2025-02-0620:40SSVC exploitation set to activeCISA-ADP

Versions per branch

NVD
Qnap qts
BranchAffectedFixed in
4.4≥ 4.4.2, < 4.4.2.12704.4.2.1270
4.4≥ 4.4.0, < 4.4.1.12614.4.1.1261
4.3≥ 4.3.6, < 4.3.6.12634.3.6.1263
4.3≥ 4.3.4, < 4.3.4.12824.3.4.1282
4.3≥ 4.3.1.0013, < 4.3.3.12524.3.3.1252
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 20200410

    Affected
    • < 4.4.2.1270fixed in 4.4.2.1270custom
  • QNAP Systems Inc. QTS

    platforms: build 20200330

    Affected
    • < 4.4.1.1261fixed in 4.4.1.1261custom
    • < 4.3.6.1263fixed in 4.3.6.1263custom
  • QNAP Systems Inc. QTS

    platforms: build 20200408

    Affected
    • < 4.3.4.1282fixed in 4.3.4.1282custom
  • QNAP Systems Inc. QTS

    platforms: build 20200409

    Affected
    • < 4.3.3.1252fixed in 4.3.3.1252custom
  • QNAP Systems Inc. QTS

    platforms: build 20200421

    Affected
    • < 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 4.4.2.1270 · 4.4.1.1261 · 4.3.6.1263 · 4.3.4.1282 · 4.3.3.1252 · 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
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

  • CISA KEVKEV entry2022-05-24
  • ENISA EUVDexploitation2022-05-242022-05-24
  • GCVEexploitation2022-05-24
  • CISA-ADPSSVC decisionactive2025-02-06
  • CNACVSS 3.18known since 2026-10-23
  • NVDCVSS 3.15.4read 2026-10-23
  • NVDCVSS 2.03.5read 2026-10-23
  • CNAweakness (CWE)CWE-79, CWE-80known since 2026-10-23
  • NVDweakness (CWE)CWE-79read 2026-10-23
  • FIRST EPSSEPSS score22.7 %read 2026-11-04
  • GitHub Advisoriesadvisory—

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Published
2020-10-28
Last Modified
2026-08-13
NVD status
Analyzed
GitHub Advisory
GHSA-wh89-fj9h-4gr8

Frequently asked questions

What is CVE-2018-19943?

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

Is CVE-2018-19943 actively exploited?

Yes. CVE-2018-19943 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-2018-19943?

CVE-2018-19943 has a CVSS v3 base score of 5.4 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

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