CASCACascade Atlas

Evidence dossier

CVE-2026-3055

Insufficient input validation leading to memory overread

Exploited in the wild (CISA KEV since Mar 30, 2026). NetScaler reports CVSS 4.0 9.3. EPSS estimates 87.2% exploit likelihood as of Aug 27, 2026.

85.4–87.7Priority evidence range
Evidence current through Aug 27, 2026, 6:09 PM UTC

As of Aug 27, 2026

Normalized restatement

Insufficient input validation in NetScaler ADC and NetScaler Gateway when configured as a SAML IDP leading to memory overread

State
PUBLISHED
Published
Mar 23, 2026
Updated
Mar 31, 2026
Evidence coverage
96%

Evidence chronology

What was known when

Download this view's receipt →
  1. 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 ↗
  2. Source dateSource date omittedFirst observed by CASCA
    NetScaler

    Record text: Insufficient input validation leading to memory overread

    Inspect raw assertion
    Field
    container
    Value
    Insufficient input validation leading to memory overread
    Original evidence ↗
  3. Source dateFirst observed by CASCA
    CISA KEV

    Exploitation cataloged: Citrix NetScaler Out-of-Bounds Read Vulnerability

    Inspect raw assertion
    Field
    observed_exploitation
    Value
    Citrix NetScaler Out-of-Bounds Read Vulnerability
    Original evidence ↗
  4. Source dateFirst observed by CASCA
    FIRST EPSS

    EPSS score: 87.17% probability · 99.74th percentile

    Inspect raw assertion
    Field
    model_probability
    Value
    Probability 0.871660000000; percentile 0.997360000000
    Original evidence ↗
ExploitationCatalog member

CISA KEV · catalog date Mar 30, 2026 · first observed Jul 19, 2026

Exploit likelihood87.17%

FIRST EPSS · score date Aug 27, 2026 · 99.7th percentile · first observed Aug 27, 2026

SeverityCVSS 9.3

NetScaler · CVSS 4.0 · first observed Jul 19, 2026 · same-version scores align in this snapshot

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 assessmentEvidence supported

Eligible evidence is present for this bounded claim.

Revision
casca-direct-cvss-eligibility-v1
Cutoff
Aug 27, 2026
Resolution
None
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-ADPIndependent enrichment
Record text

CISA ADP Vulnrichment

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

Insufficient input validation leading to memory overread

Inspect raw assertion
Field
container
Value
Insufficient input validation leading to memory overread
Source dateSource date omittedFirst observed by CASCAOriginal evidence ↗
CISA KEVOriginal assertion
Exploitation cataloged

Citrix NetScaler Out-of-Bounds Read Vulnerability

Inspect raw assertion
Field
observed_exploitation
Value
Citrix NetScaler Out-of-Bounds Read Vulnerability
Source dateFirst observed by CASCAOriginal evidence ↗
FIRST EPSSOriginal assertion
EPSS score

87.17% probability · 99.74th percentile

Inspect raw assertion
Field
model_probability
Value
Probability 0.871660000000; percentile 0.997360000000
Source dateFirst observed by CASCAOriginal evidence ↗

Applicability

Cited product scope

Trace impact →
6Underlying assertions
2Canonical products
6Target assertions
0Constraint assertions

Grouped from 2 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

NetScaler · source assertedNetScalerADCDirect source scope
Affected: 14.1 to before 66.59 (patch comparison)Affected: 13.1 to before 62.23 (patch comparison)Affected: 13.1 FIPS and NDcPP to before 37.262 (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": "66.59", "versionType": "patch"}, {"status": "affected", "version": "13.1", "lessThan": "62.23", "versionType": "patch"}, {"status": "affected", "version": "13.1 FIPS and NDcPP", "lessThan": "37.262", "versionType": "patch"}]
NetScaler · source assertedNetScalerGatewayDirect source scope
Affected: 14.1 to before 66.59 (patch comparison)Affected: 13.1 to before 62.23 (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": "66.59", "versionType": "patch"}, {"status": "affected", "version": "13.1", "lessThan": "62.23", "versionType": "patch"}]
NVD CPE · APPLICATIONcitrixnetscaler_application_delivery_controllerVulnerable target · 4 assertions
Any version (unconstrained) (>= 13.1, < 13.1-37.262); Any version (unconstrained) (>= 13.1, < 13.1-62.23); Any version (unconstrained) (>= 14.1, < 14.1-60.58)Canonical identity product-698b699e3cb954f9bb1c9b64d30a2b05877d903ca4042465e866b06d7d56b465Linked exact
Scope supported
Inspect raw assertions
  1. 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 13.1; through excluding 13.1-37.262
    Match ID
    453e034f-91b1-48e0-a0c2-4de99ea221db
  2. 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 13.1; through excluding 13.1-37.262
    Match ID
    5c536886-5796-4fb4-bb94-be34de32339a
  3. cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:-:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 3
    Logic
    OR
    Version bounds
    from including 14.1; through excluding 14.1-60.58
    Match ID
    f1145e85-5aec-4584-a385-1daa2084cd9f
  4. 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 13.1; through excluding 13.1-62.23
    Match ID
    e2dfb77e-b610-4fac-84eb-cab9d68f16f4
NVD CPE · APPLICATIONcitrixnetscaler_gatewayVulnerable target · 2 assertions
Any version (unconstrained) (>= 13.1, < 13.1-62.23); Any version (unconstrained) (>= 14.1, < 14.1-60.58)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
    1 · node/0 · match 1
    Logic
    OR
    Version bounds
    from including 14.1; through excluding 14.1-60.58
    Match ID
    fea94a98-44d9-4a3a-8713-7a4963cd820b
  2. cpe:2.3:a:citrix:netscaler_gateway:*:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    1 · node/0 · match 0
    Logic
    OR
    Version bounds
    from including 13.1; through excluding 13.1-62.23
    Match ID
    46a54bc1-9ea0-4f74-81d1-48fb04ae4479

Affected-product evidence

Accepted scope and product mapping

2 canonical links · 1 source-reported links

Mapping establishedEvidence supported

vendor-613dd4bb79ad8759a10407fe624cb651bdb422f3f2780231736f064b614ee756 · product-22e4fbefa2f721b35fa638467110ee91acacd31f29e7473b059c6b09738443c7

Source class
Nvd cpe vulnerable target
Assertions
2
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Aug 27, 2026
Retained assertion IDs
184fec52-f0fb-4a3b-af6a-f677c4d320afcd5d512b-d0f6-44eb-a890-01dc26f769ef
Mapping establishedEvidence supported

vendor-613dd4bb79ad8759a10407fe624cb651bdb422f3f2780231736f064b614ee756 · product-698b699e3cb954f9bb1c9b64d30a2b05877d903ca4042465e866b06d7d56b465

Source class
Nvd cpe vulnerable target
Assertions
4
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Aug 27, 2026
Retained assertion IDs
56eb23f5-8be4-4d30-9ba6-893ab764d47a6e4e2c0d-2b8c-4062-b346-e2563bfbac29bcd3c3d7-39cc-4c20-b066-28eaf5f09d19bdaea7f2-dcbe-49ea-84c4-6f2d2679ece0
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
6ad6f9e4-0a6e-4afb-af3e-bdd9f864f37fa9a37bb4-f63a-4b63-93a3-29d72bf4db38

Assessments

CVSS by origin

9.8
NVDCVSS 3.1 · role Primary · priority eligiblevalid_matchCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.3
CVE Program sourceCVSS 4.0 · role Secondary · priority eligiblevalid_matchCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
9.3
NetScalerCVSS 4.0 · role unknown · display onlyDirect record assessment retained outside normalized eligibilityCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L

Direct CVE/CNA normalized decisions

9.3Priority eligible

NetScaler

CVSS 4.0 · Primary · Original assertion · rank 1

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L
Validation
Valid match
Recomputed
9.3
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.