CASCACascade Atlas

Evidence dossier

CVE-2023-6549

CVE-2023-6549

73.9–90.7Priority evidence range
As known Jul 19, 2026, 5:00 AM UTCgen-56ccdaf9

Normalized restatement

Improper Restriction of Operations within the Bounds of a Memory Buffer in NetScaler ADC and NetScaler Gateway allows Unauthenticated Denial of Service and Out-Of-Bounds Memory Read

State
PUBLISHED
Published
Jan 17, 2024
Updated
Oct 21, 2025
Evidence coverage
85%
CISA KEVCatalog member

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

FIRST EPSS57.63%

2026-07-18 · v2026.06.15 · percentile 99.0%

Source stateNo scored conflict

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

Source comparison

Who said what

CISA-ADPindependent enrichment
container

CISA ADP Vulnrichment

Citrixoriginal assertion
container

Improper Restriction of Operations within the Bounds of a Memory Buffer in NetScaler ADC and NetScaler Gateway allows Unauthenticated Denial of Service and Out-Of-Bounds Memory Read

CVEderivative copy
container

CVE Program Container

CISA KEVoriginal assertion
observed_exploitation

Citrix NetScaler ADC and NetScaler Gateway Buffer Overflow Vulnerability

FIRST EPSSoriginal assertion
model_probability

Probability 0.576330000000; percentile 0.989780000000

Applicability

Cited product scope

Trace impact →
Cloud Software GroupNetScaler ADC
[{"status": "affected", "version": "14.1", "lessThan": "12.35", "versionType": "patch"}, {"status": "affected", "version": "13.1", "lessThan": "51.15", "versionType": "patch"}, {"status": "affected", "version": "13.0", "lessThan": "92.21", "versionType": "patch"}, {"status": "affected", "version": "13.1-FIPS", "lessThan": "37.176", "versionType": "patch"}, {"status": "affected", "version": "12.1-FIPS", "lessThan": "55.302", "versionType": "patch"}, {"status": "affected", "version": "12.1-NDcPP", "lessThan": "55.302", "versionType": "patch"}]unknown
Unknown vendorUnknown product
cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:-:*:*:*; start including 13.0; end excluding 13.0-92.21supported
Unknown vendorUnknown product
cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:-:*:*:*; start including 13.1; end excluding 13.1-51.15supported
Unknown vendorUnknown product
cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:-:*:*:*; start including 14.1; end excluding 14.1-12.35supported
Unknown vendorUnknown product
cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:fips:*:*:*; start including 12.1; end excluding 12.1-55.302supported
Unknown vendorUnknown product
cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:fips:*:*:*; start including 13.1; end excluding 13.1-37.176supported
Unknown vendorUnknown product
cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:ndcpp:*:*:*; start including 12.1; end excluding 12.1-55.302supported
Unknown vendorUnknown product
cpe:2.3:a:citrix:netscaler_gateway:*:*:*:*:*:*:*:*; start including 13.0; end excluding 13.0-92.21supported
Unknown vendorUnknown product
cpe:2.3:a:citrix:netscaler_gateway:*:*:*:*:*:*:*:*; start including 13.1; end excluding 13.1-51.15supported
Unknown vendorUnknown product
cpe:2.3:a:citrix:netscaler_gateway:*:*:*:*:*:*:*:*; start including 14.1; end excluding 14.1-12.35supported

Assessments

CVSS by origin

7.5
nvd@nist.govCVSS 3.1 · role PrimaryCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
8.2
secure@citrix.comCVSS 3.1 · role SecondaryCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
8.2
CitrixCVSS 3.1 · role unknownCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/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.