CASCACascade Atlas

Evidence dossier

CVE-2025-6543

Memory overflow vulnerability leading to unintended control flow and Denial of Service

69.2–85.7Priority evidence range
As known Jul 19, 2026, 5:00 AM UTCgen-56ccdaf9

Normalized restatement

Memory overflow vulnerability leading to unintended control flow and Denial of Service in NetScaler ADC and NetScaler Gateway when configured as Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) OR AAA virtual server

State
PUBLISHED
Published
Jun 25, 2025
Updated
Feb 26, 2026
Evidence coverage
85%
CISA KEVCatalog member

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

FIRST EPSS9.76%

2026-07-18 · v2026.06.15 · percentile 95.0%

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

Memory overflow vulnerability leading to unintended control flow and Denial of Service

CISA KEVoriginal assertion
observed_exploitation

Citrix NetScaler ADC and Gateway Buffer Overflow Vulnerability

FIRST EPSSoriginal assertion
model_probability

Probability 0.097560000000; percentile 0.949950000000

Applicability

Cited product scope

Trace impact →
NetScalerADC
[{"status": "affected", "version": "14.1", "lessThan": "47.46", "versionType": "patch"}, {"status": "affected", "version": "13.1", "lessThan": "59.19", "versionType": "patch"}, {"status": "affected", "version": "13.1 FIPS and NDcPP", "lessThan": "37.236", "versionType": "patch"}]unknown
NetScalerGateway
[{"status": "affected", "version": "14.1", "lessThan": "47.46", "versionType": "patch"}, {"status": "affected", "version": "13.1", "lessThan": "59.19", "versionType": "patch"}, {"status": "affected", "version": "13.1 FIPS and NDcPP", "lessThan": "37.236", "versionType": "patch"}]unknown
Unknown vendorUnknown product
cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:-:*:*:*; start including 13.1; end excluding 13.1-59.19supported
Unknown vendorUnknown product
cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:-:*:*:*; start including 14.1; end excluding 14.1-47.46supported
Unknown vendorUnknown product
cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:fips:*:*:*; start including 13.1; end excluding 13.1-37.236supported
Unknown vendorUnknown product
cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:ndcpp:*:*:*; start including 13.1; end excluding 13.1-37.236supported
Unknown vendorUnknown product
cpe:2.3:a:citrix:netscaler_gateway:*:*:*:*:*:*:*:*; start including 13.1; end excluding 13.1-59.19supported
Unknown vendorUnknown product
cpe:2.3:a:citrix:netscaler_gateway:*:*:*:*:*:*:*:*; start including 14.1; end excluding 14.1-47.46supported

Assessments

CVSS by origin

9.8
nvd@nist.govCVSS 3.1 · role PrimaryCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.2
secure@citrix.comCVSS 4.0 · role SecondaryCVSS:4.0/AV:N/AC:H/AT:P/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
9.2
CitrixCVSS 4.0 · role unknownCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L

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.