CASCACascade Atlas

Evidence dossier

CVE-2026-8452

Memory overflow vulnerability leading to unpredictable or erroneous behavior and Denial of Service

Exploited in the wild (CISA KEV since Aug 26, 2026). NetScaler reports CVSS 4.0 8.8. EPSS estimates 1.6% exploit likelihood as of Aug 27, 2026.

64.5–73.3Priority evidence range
Evidence current through Aug 27, 2026, 6:09 PM UTC

As of Aug 27, 2026

Normalized restatement

Memory overflow vulnerability NetScaler ADC and NetScaler Gateway leading to unpredictable or erroneous behavior and Denial of Service if the appliance is configured as a Gateway (SSL VPN, ICA Proxy, CVPN, RDP Proxy) or AAA virtual server

State
PUBLISHED
Published
Jun 30, 2026
Updated
Jun 30, 2026
Evidence coverage
85%

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: Memory overflow vulnerability leading to unpredictable or erroneous behavior and Denial of Service

    Inspect raw assertion
    Field
    container
    Value
    Memory overflow vulnerability leading to unpredictable or erroneous behavior and Denial of Service
    Original evidence ↗
  3. Source dateFirst observed by CASCA
    CISA KEV

    Exploitation cataloged: Citrix NetScaler ADC and NetScaler Gateway Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability

    Inspect raw assertion
    Field
    observed_exploitation
    Value
    Citrix NetScaler ADC and NetScaler Gateway Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability
    Original evidence ↗
  4. Source dateFirst observed by CASCA
    FIRST EPSS

    EPSS score: 1.61% probability · 74.09th percentile

    Inspect raw assertion
    Field
    model_probability
    Value
    Probability 0.016060000000; percentile 0.740880000000
    Original evidence ↗
ExploitationCatalog member

CISA KEV · catalog date Aug 26, 2026 · first observed Aug 27, 2026

Exploit likelihood1.61%

FIRST EPSS · score date Aug 27, 2026 · 74.1th percentile · first observed Aug 27, 2026

SeverityCVSS 8.8

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

Memory overflow vulnerability leading to unpredictable or erroneous behavior and Denial of Service

Inspect raw assertion
Field
container
Value
Memory overflow vulnerability leading to unpredictable or erroneous behavior and Denial of Service
Source dateSource date omittedFirst observed by CASCAOriginal evidence ↗
CISA KEVOriginal assertion
Exploitation cataloged

Citrix NetScaler ADC and NetScaler Gateway Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability

Inspect raw assertion
Field
observed_exploitation
Value
Citrix NetScaler ADC and NetScaler Gateway Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability
Source dateFirst observed by CASCAOriginal evidence ↗
FIRST EPSSOriginal assertion
EPSS score

1.61% probability · 74.09th percentile

Inspect raw assertion
Field
model_probability
Value
Probability 0.016060000000; percentile 0.740880000000
Source dateFirst observed by CASCAOriginal evidence ↗

Applicability

Cited product scope

Trace impact →
7Underlying assertions
2Canonical products
7Target 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

NetScaler · source assertedNetScalerADCDirect source scope
Affected: 14.1 to before 72.61 (patch comparison)Affected: 13.1 to before 63.18 (patch comparison)Affected: 14.1 FIPS to before 72.61 (patch comparison)Affected: 13.1 FIPS and NDcPP to before 37.272 (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": "72.61", "versionType": "patch"}, {"status": "affected", "version": "13.1", "lessThan": "63.18", "versionType": "patch"}, {"status": "affected", "version": "14.1 FIPS", "lessThan": "72.61", "versionType": "patch"}, {"status": "affected", "version": "13.1 FIPS and NDcPP", "lessThan": "37.272", "versionType": "patch"}]
NetScaler · source assertedNetScalerGatewayDirect source scope
Affected: 14.1 to before 72.61 (patch comparison)Affected: 13.1 to before 63.18 (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": "72.61", "versionType": "patch"}, {"status": "affected", "version": "13.1", "lessThan": "63.18", "versionType": "patch"}]
NVD CPE · APPLICATIONcitrixnetscaler_application_delivery_controllerVulnerable target · 5 assertions
Any version (unconstrained) (>= 13.1, < 13.1-63.18); Any version (unconstrained) (< 13.1-37.272); Any version (unconstrained) (>= 14.1, < 14.1-72.61); Version 14.1-66.68Canonical 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
    through excluding 13.1-37.272
    Match ID
    d8189708-5190-45e3-bf9a-7a429e87dfe7
  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 13.1; through excluding 13.1-63.18
    Match ID
    bc139a27-d7ce-4d92-9a1f-09713c4c9546
  3. 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
    through excluding 13.1-37.272
    Match ID
    d93a5760-5c50-4786-b981-24a7b35c3055
  4. cpe:2.3:a:citrix:netscaler_application_delivery_controller:14.1-66.68:*:*:*:fips:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 4
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    a2bc089b-97d0-4fdb-a336-74409dcdc5e3
  5. 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 14.1-72.61
    Match ID
    0108075c-1047-449c-a707-f2532770c2ad
NVD CPE · APPLICATIONcitrixnetscaler_gatewayVulnerable target · 2 assertions
Any version (unconstrained) (>= 13.1, < 13.1-63.18); Any version (unconstrained) (>= 14.1, < 14.1-72.61)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 5
    Logic
    OR
    Version bounds
    from including 13.1; through excluding 13.1-63.18
    Match ID
    962d2276-7285-41e2-a867-d464ae11677f
  2. 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 14.1; through excluding 14.1-72.61
    Match ID
    1591fbce-57dd-416f-a858-e898b0946ab6

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
0024ab59-8afa-4ab8-b711-75ee4ea5f9e2654e0c80-5a13-4aa1-b997-6857ff09cae9
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
7
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Aug 27, 2026
Retained assertion IDs
11afbc7f-c397-41aa-83dc-04b4665223852f7f927b-7005-41cc-8124-8b22cc098aff3b689fe2-3de9-43c8-9b01-0468d4d8641761504523-d2e9-40a0-a878-d32da97ec499b214b413-f1b0-461b-88da-16a685aa128ecbb645cc-a255-437f-befc-bb8c9c147774e1518477-5cdb-44e2-8b81-5498a5519246

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
8.8
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:L/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
8.8
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:L/VA:H/SC:L/SI:L/SA:L

Direct CVE/CNA normalized decisions

8.8Priority 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:L/VA:H/SC:L/SI:L/SA:L
Validation
Valid match
Recomputed
8.8
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.