CASCACascade Atlas

Evidence dossier

CVE-2018-19943

CVE-2018-19943

57.2–83.4Priority evidence range
As known Jul 19, 2026, 5:00 AM UTCgen-56ccdaf9

Normalized restatement

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

State
PUBLISHED
Published
Oct 28, 2020
Updated
Oct 21, 2025
Evidence coverage
72%
CISA KEVCatalog member

Apply updates per vendor instructions.

FIRST EPSS17.71%

2026-07-18 · v2026.06.15 · percentile 96.8%

Source stateConflict visible

Distinct CVSS assessments remain side by side; none are averaged.

Source comparison

Who said what

CISA-ADPindependent enrichment
container

CISA ADP Vulnrichment

CVEderivative copy
container

CVE Program Container

qnaporiginal assertion
container

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

CISA KEVoriginal assertion
observed_exploitation

QNAP NAS File Station Cross-Site Scripting Vulnerability

FIRST EPSSoriginal assertion
model_probability

Probability 0.177050000000; percentile 0.968190000000

Applicability

Cited product scope

Trace impact →
QNAP Systems Inc.QTS
[{"status": "affected", "version": "unspecified", "lessThan": "4.4.2.1270", "versionType": "custom"}]unknown
QNAP Systems Inc.QTS
[{"status": "affected", "version": "unspecified", "lessThan": "4.4.1.1261", "versionType": "custom"}, {"status": "affected", "version": "unspecified", "lessThan": "4.3.6.1263", "versionType": "custom"}]unknown
QNAP Systems Inc.QTS
[{"status": "affected", "version": "unspecified", "lessThan": "4.3.4.1282", "versionType": "custom"}]unknown
QNAP Systems Inc.QTS
[{"status": "affected", "version": "unspecified", "lessThan": "4.3.3.1252", "versionType": "custom"}]unknown
QNAP Systems Inc.QTS
[{"status": "affected", "version": "unspecified", "lessThan": "4.2.6", "versionType": "custom"}]unknown
Unknown vendorUnknown product
cpe:2.3:o:qnap:qts:*:*:*:*:*:*:*:*; end excluding 4.2.6supported
Unknown vendorUnknown product
cpe:2.3:o:qnap:qts:*:*:*:*:*:*:*:*; start including 4.3.1.0013; end excluding 4.3.3.1252supported
Unknown vendorUnknown product
cpe:2.3:o:qnap:qts:*:*:*:*:*:*:*:*; start including 4.3.4; end excluding 4.3.4.1282supported
Unknown vendorUnknown product
cpe:2.3:o:qnap:qts:*:*:*:*:*:*:*:*; start including 4.3.6; end excluding 4.3.6.1263supported
Unknown vendorUnknown product
cpe:2.3:o:qnap:qts:*:*:*:*:*:*:*:*; start including 4.4.0; end excluding 4.4.1.1261supported
Unknown vendorUnknown product
cpe:2.3:o:qnap:qts:*:*:*:*:*:*:*:*; start including 4.4.2; end excluding 4.4.2.1270supported
Unknown vendorUnknown product
cpe:2.3:o:qnap:qts:4.2.6:-:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:qnap:qts:4.2.6:build_20170517:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:qnap:qts:4.2.6:build_20190322:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:qnap:qts:4.2.6:build_20190730:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:qnap:qts:4.2.6:build_20190921:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:qnap:qts:4.2.6:build_20191107:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:qnap:qts:4.2.6:build_20200109:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:qnap:qts:4.2.6:build_20200421:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:qnap:qts:4.2.6:build_20200611:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:qnap:qts:4.2.6:build_20200821:*:*:*:*:*:*supported

Assessments

CVSS by origin

5.4
nvd@nist.govCVSS 3.1 · role PrimaryCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
3.5
nvd@nist.govCVSS 2.0 · role PrimaryAV:N/AC:M/Au:S/C:N/I:P/A:N
8.0
security@qnapsecurity.com.twCVSS 3.1 · role SecondaryCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H
8.0
qnapCVSS 3.1 · role unknownCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H

Limitations and unknowns

  • KEV membership is authoritative for the catalog, not proof of exposure in any environment.
  • EPSS is a dated model probability and not an individual-environment prediction.
  • Affected or fixed status applies only to the exact cited product and version scope; unresolved scope remains unknown.
  • NVD-carried upstream facts remain derivative and are not independent corroboration.
  • Only NVD metrics validated under the generation-bound calculator are Public Priority eligible; direct CVE record metrics remain display-only.
  • NVD CVSS source eligibility is closed: NVD-authored, exact record-source, or registered same-CVE container origin; unmapped sources remain display-only.
  • Factor D is unknown in Public Core because no accepted canonical mapping-obligation ledger is present.
  • Core replay supports the active and immediately prior generation; retrospective valid-at replay is deferred.