EUVD-2026-87971
GHSA-whfq-j52q-fpq7
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N/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
Unauthenticated network vector with low complexity and no interaction (AV:N/AC:L/PR:N/UI:N); impact is primarily availability (A:H) from the memory overflow, with limited C/I (L) matching the vendor's VC:L/VI:L.
Primary rating from Vendor (NetScaler).
CVSS VectorVendor: NetScaler
Lifecycle Timeline
3DescriptionCVE.org
Memory overflow vulnerability vulnerability in Citrix NetScaler ADC and Citrix NetScaler Gateway. This issue affects ADC: before 14.1-73.37, before 13.1-64.23, before 14.1-73.37 FIPS, and before 13.1.37.279 FIPS and NDcPP; Gateway: before 14.1-73.37 and before 13.1-64.23 leading to unpredictable or erroneous behavior or Denial of Service
AnalysisAI
A memory overflow in Citrix NetScaler ADC and NetScaler Gateway can be triggered by unauthenticated remote attackers (CVSS vector PR:N/UI:N/AV:N), causing unpredictable appliance behavior and denial of service. Affected deployments are ADC before 14.1-73.37, before 13.1-64.23, before 14.1-73.37 FIPS, and before 13.1.37.279 FIPS/NDcPP, plus Gateway before 14.1-73.37 and before 13.1-64.23. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The CVSS vector (PR:N/UI:N/AV:N) indicates unauthenticated remote exploitation with no user interaction against network-reachable NetScaler ADC or Gateway instances. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor-supplied CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N) describes a network-reachable, low-complexity, unauthenticated attack with no user interaction - a profile that normally warrants urgent attention on an internet-facing appliance. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Vendor-released patch: upgrade NetScaler ADC to 14.1-73.37 or 13.1-64.23 (or 14.1-73.37 FIPS / 13.1.37.279 FIPS for FIPS and NDcPP builds), and upgrade NetScaler Gateway to 14.1-73.37 or 13.1-64.23; review Citrix support article CTX697096 for the definitive fixed-build list and any appliance-specific upgrade sequencing. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Citrix NetScaler ADC and Gateway instances to identify those running versions before 14.1-73.37, 13.1-64.23, 14.1-73.37 FIPS, 13.1.37.279 FIPS/NDcPP, and Gateway before 14.1-73.37 and 13.1-64.23; restrict network access to these appliances from untrusted sources and enable logging and monitoring for availability anomalies. …
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Citrix NetScaler ADC and NetScaler Gateway deployments running builds prior to 14.1-73.37 or 13.1-64.23 (including the c
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Memory overflow in Citrix NetScaler ADC and NetScaler Gateway running versions prior to 14.1-73.37 or 13.1-64.23 (and th
Same weakness CWE-119 – Buffer Overflow
View allSame technique Buffer Overflow
View allShare
External POC / Exploit Code
Leaving vuln.today