CASCACascade Atlas

Evidence dossier

CVE-2023-4966

Unauthenticated sensitive information disclosure

Exploited in the wild (CISA KEV since Oct 18, 2023). NVD reports CVSS 3.1 7.5. Severity assessments differ within at least one CVSS version. EPSS estimates 100.0% exploit likelihood as of Aug 6, 2026.

78.7–93.0Priority evidence range
Evidence current through Aug 27, 2026, 6:09 PM UTC

As of Aug 27, 2026

Normalized restatement

Sensitive information disclosure in NetScaler ADC and NetScaler Gateway when configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) or AAA virtual server.

State
PUBLISHED
Published
Oct 10, 2023
Updated
Jul 31, 2026
Evidence coverage
72%

Evidence chronology

What was known when

Download this view's receipt →
  1. Source dateFirst observed by CASCA
    CISA KEV

    Exploitation cataloged: Citrix NetScaler ADC and NetScaler Gateway Buffer Overflow Vulnerability

    Inspect raw assertion
    Field
    observed_exploitation
    Value
    Citrix NetScaler ADC and NetScaler Gateway Buffer Overflow Vulnerability
    Original evidence ↗
  2. Source dateSource date omittedFirst observed by CASCA
    CISA-ADP

    Record text: CISA ADP Vulnrichment

    Inspect raw assertion
    Field
    container
    Value
    CISA ADP Vulnrichment
    Original evidence ↗
  3. Source dateSource date omittedFirst observed by CASCA
    Citrix

    Record text: Unauthenticated sensitive information disclosure

    Inspect raw assertion
    Field
    container
    Value
    Unauthenticated sensitive information disclosure
    Original evidence ↗
  4. Source dateSource date omittedFirst observed by CASCA
    CVE Program

    Record text: CVE Program Container

    Inspect raw assertion
    Field
    container
    Value
    CVE Program Container
    Original evidence ↗
  5. Source dateFirst observed by CASCA
    FIRST EPSS

    EPSS score: 100% probability · 100th percentile

    Inspect raw assertion
    Field
    model_probability
    Value
    Probability 0.999990000000; percentile 0.999980000000
    Original evidence ↗

Assessments differ

NVD7.5CVSS 3.1 · source date omitted
secure@citrix.com9.4CVSS 3.1 · source date omitted

Values are shown separately by source and CVSS version.

ExploitationCatalog member

CISA KEV · catalog date Oct 18, 2023 · first observed Jul 19, 2026

Exploit likelihood100.00%

FIRST EPSS · score date Aug 6, 2026 · 100th percentile · first observed Aug 6, 2026

SeverityAssessments differ

NVD · CVSS 3.1 · first observed Aug 1, 2026 · values shown separately below

Evidence detail

Source limits and decisions

Why each evidence state has this value

casca-unknown-reasons-v1
Exploitation statusEvidence supported

Eligible evidence is present for this bounded claim.

Revision
evidence-policy-v1.1.0
Cutoff
Aug 27, 2026
Resolution
None
Exploit likelihoodEvidence supported

Eligible evidence is present for this bounded claim.

Revision
evidence-policy-v1.1.0
Cutoff
Aug 27, 2026
Resolution
None
Severity assessmentAssessments differ

Eligible assertions materially conflict and remain visible side by side.

Revision
casca-direct-cvss-eligibility-v1
Cutoff
Aug 27, 2026
Resolution
Resolve conflict
Affected productsSource-reported scope

The cited source assertion is retained while canonical product linkage remains open.

Revision
casca-factor-d-obligations-v1
Cutoff
Aug 27, 2026
Resolution
Resolve identity

Source comparison

Who said what

CISA KEVOriginal assertion
Exploitation cataloged

Citrix NetScaler ADC and NetScaler Gateway Buffer Overflow Vulnerability

Inspect raw assertion
Field
observed_exploitation
Value
Citrix NetScaler ADC and NetScaler Gateway Buffer Overflow Vulnerability
Source dateFirst observed by CASCAOriginal evidence ↗
CISA-ADPIndependent enrichment
Record text

CISA ADP Vulnrichment

Inspect raw assertion
Field
container
Value
CISA ADP Vulnrichment
Source dateSource date omittedFirst observed by CASCAOriginal evidence ↗
CitrixOriginal assertion
Record text

Unauthenticated sensitive information disclosure

Inspect raw assertion
Field
container
Value
Unauthenticated sensitive information disclosure
Source dateSource date omittedFirst observed by CASCAOriginal evidence ↗
CVE ProgramDerivative copy
Record text

CVE Program Container

Inspect raw assertion
Field
container
Value
CVE Program Container
Source dateSource date omittedFirst observed by CASCAOriginal evidence ↗
FIRST EPSSOriginal assertion
EPSS score

100% probability · 100th percentile

Inspect raw assertion
Field
model_probability
Value
Probability 0.999990000000; percentile 0.999980000000
Source dateFirst observed by CASCAOriginal evidence ↗

Applicability

Cited product scope

Trace impact →
9Underlying assertions
2Canonical products
9Target assertions
0Constraint assertions

Grouped from 1 configuration nodes in this exact snapshot. Visual grouping is navigational; asset exposure and root cause require cited evidence.

Identity source boundaries
  • Cpe dictionary1,775,266 records · observed through 2026-07-21T06:45:29.809Z27d65b0f-b718-4b4f-bb79-c47c68d09dfa
  • Cpe match643,502 records · observed through 2026-07-21T08:13:17.697Z955dae73-7302-438b-aee1-058d7cc5d48e

4 scope groups

Citrix · source assertedCitrixNetScaler ADCDirect source scope
Affected: 14.1 to before 8.50 (patch comparison)Affected: 13.1 to before 49.15 (patch comparison)Affected: 13.0 to before 92.19 (patch comparison)Affected: 13.1-FIPS to before 37.164 (patch comparison)Affected: 12.1-FIPS to before 55.300 (patch comparison)Affected: 12.1-NDcPP to before 55.300 (patch comparison)
Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion[{"status": "affected", "version": "14.1", "lessThan": "8.50", "versionType": "patch"}, {"status": "affected", "version": "13.1", "lessThan": "49.15", "versionType": "patch"}, {"status": "affected", "version": "13.0", "lessThan": "92.19", "versionType": "patch"}, {"status": "affected", "version": "13.1-FIPS", "lessThan": "37.164", "versionType": "patch"}, {"status": "affected", "version": "12.1-FIPS", "lessThan": "55.300", "versionType": "patch"}, {"status": "affected", "version": "12.1-NDcPP", "lessThan": "55.300", "versionType": "patch"}]
Citrix · source assertedCitrixNetScaler GatewayDirect source scope
Affected: 14.1 to before 8.50 (patch comparison)Affected: 13.1 to before 49.15 (patch comparison)Affected: 13.0 to before 92.19 (patch comparison)
Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion[{"status": "affected", "version": "14.1", "lessThan": "8.50", "versionType": "patch"}, {"status": "affected", "version": "13.1", "lessThan": "49.15", "versionType": "patch"}, {"status": "affected", "version": "13.0", "lessThan": "92.19", "versionType": "patch"}]
NVD CPE · APPLICATIONcitrixnetscaler_application_delivery_controllerVulnerable target · 6 assertions
Any version (unconstrained) (>= 12.1, < 12.1-55.300); Any version (unconstrained) (>= 13.0, < 13.0-92.19); Any version (unconstrained) (>= 13.1, < 13.1-37.164); Any version (unconstrained) (>= 13.1, < 13.1-49.15); Any version (unconstrained) (>= 14.1, < 14.1-8.50)Canonical identity product-698b699e3cb954f9bb1c9b64d30a2b05877d903ca4042465e866b06d7d56b465Linked exact
Scope supported
Inspect raw assertions
  1. cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:ndcpp:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 1
    Logic
    OR
    Version bounds
    from including 12.1; through excluding 12.1-55.300
    Match ID
    81ef12c2-4197-4c0d-be11-556f05dad646
  2. cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:-:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 2
    Logic
    OR
    Version bounds
    from including 13.0; through excluding 13.0-92.19
    Match ID
    9eec53b2-686a-4c6f-98de-5d6ae804b0a8
  3. cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:fips:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 3
    Logic
    OR
    Version bounds
    from including 13.1; through excluding 13.1-37.164
    Match ID
    109301a8-9add-4a49-9c45-d21a4da840e9
  4. cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:-:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 5
    Logic
    OR
    Version bounds
    from including 14.1; through excluding 14.1-8.50
    Match ID
    9148c36d-98b4-4166-8b9a-449ea86ba4b1
  5. cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:-:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 4
    Logic
    OR
    Version bounds
    from including 13.1; through excluding 13.1-49.15
    Match ID
    5c1739c5-48c1-46bc-a524-b4cc4c5b6436
  6. cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:fips:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 0
    Logic
    OR
    Version bounds
    from including 12.1; through excluding 12.1-55.300
    Match ID
    492beb4b-7a4b-47c2-93d1-2b0683aa3a20
NVD CPE · APPLICATIONcitrixnetscaler_gatewayVulnerable target · 3 assertions
Any version (unconstrained) (>= 13.0, < 13.0-92.19); Any version (unconstrained) (>= 13.1, < 13.1-49.15); Any version (unconstrained) (>= 14.1, < 14.1-8.50)Canonical identity product-22e4fbefa2f721b35fa638467110ee91acacd31f29e7473b059c6b09738443c7Linked exact
Scope supported
Inspect raw assertions
  1. cpe:2.3:a:citrix:netscaler_gateway:*:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 6
    Logic
    OR
    Version bounds
    from including 13.0; through excluding 13.0-92.19
    Match ID
    5fb1412d-f8d8-4592-a8a9-c1b841b93d5e
  2. cpe:2.3:a:citrix:netscaler_gateway:*:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 7
    Logic
    OR
    Version bounds
    from including 13.1; through excluding 13.1-49.15
    Match ID
    28a08b32-d145-499f-866e-beeedebb2901
  3. cpe:2.3:a:citrix:netscaler_gateway:*:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 8
    Logic
    OR
    Version bounds
    from including 14.1; through excluding 14.1-8.50
    Match ID
    4f1610e6-fe48-4339-8e74-765e0517e33d

Affected-product evidence

Accepted scope and product mapping

0 canonical links · 2 source-reported links

Source-reported scopeSource-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Vendor specified only by source · Product specified only by source

Source class
Direct cve affected
Assertions
2
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Aug 27, 2026
Retained assertion IDs
70692f6b-dd7a-4287-b6f4-f85e6173bf38b2549206-9f7e-4cbe-bb62-e7e61b7ee128
Source-reported scopeSource-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Vendor specified only by source · Product specified only by source

Source class
Nvd cpe vulnerable target
Assertions
9
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Aug 27, 2026
Retained assertion IDs
79de3bf4-46aa-4e11-859f-4e89734949e6a58c0d64-a59e-4c6f-aaba-a351d007184bb9d49328-c56d-40ff-959d-fbf91cffaf0ebb537488-b19f-4742-8039-5d9bbfd86506c045aa90-c833-4de6-857e-fe25c6f2187fc16c3f31-3a3a-4c50-9b43-4a440fe6769fc183d83b-cdcd-4a58-89f7-6c1b2ae5e8ddf59223b3-b144-43d7-bc04-7ed82b43aefef76db4da-ea18-470f-9163-5c5be9e8964c

Assessments

CVSS by origin

7.5
NVDCVSS 3.1 · role Primary · priority eligiblevalid_matchCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
9.4
secure@citrix.comCVSS 3.1 · role Secondary · priority eligiblevalid_matchCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
9.4
CitrixCVSS 3.1 · role unknown · display onlyDirect record assessment retained outside normalized eligibilityCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L

Direct CVE/CNA normalized decisions

9.4Priority eligible

Citrix

CVSS 3.1 · Primary · Original assertion · rank 1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
Validation
Valid match
Recomputed
9.4
Decision reason
Evidence supported
Policy
casca-direct-cvss-eligibility-v1

Assessments are retained side by side under closed precedence. Cascade never averages CVSS.

Evidence boundaries

  • 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; remaining scope stays source-scoped.
  • NVD-carried upstream facts remain derivative; independent corroboration requires a separately authored source.
  • 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.
  • Core replay supports the active and immediately prior generation; retrospective valid-at replay is deferred.
  • OSV aggregation and OSV-converted NVD material are not independent corroboration.
  • Red Hat facts are vendor assertions for the exact supplied products.
  • Nonmembership and not-yet-observed states are not proof of safety.