Citrix NetScaler ADC and NetScaler Gateway Buffer Overflow Vulnerability

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Summary

CVECVE-2023-6549
StatePUBLISHED
AssignerUnknown
Source PriorityCVE Program / NVD first with legacy fallback
Published2024-01-17 21:15:00 UTC
Updated2024-01-24 20:48:00 UTC
DescriptionCitrix NetScaler ADC and NetScaler Gateway contain a buffer overflow vulnerability that allows for a denial-of-service when configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) or AAA virtual server.

Risk And Classification

EPSS: 0.765090000 probability, percentile 0.989460000 (date 2026-04-22)

CISA KEV: Listed on 2024-01-17; due 2024-02-07; ransomware use Unknown

Problem Types: CWE-119

CISA Known Exploited Vulnerability

VendorCitrix
ProductNetScaler ADC and NetScaler Gateway
NameCitrix NetScaler ADC and NetScaler Gateway Buffer Overflow Vulnerability
Required ActionApply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Noteshttps://support.citrix.com/article/CTX584986/netscaler-adc-and-netscaler-gateway-security-bulletin-for-cve20236548-and-cve20236549; https://nvd.nist.gov/vuln/detail/CVE-2023-6549

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Citrix Netscaler Application Delivery Controller All All All All
Application Citrix Netscaler Application Delivery Controller All All All All
Application Citrix Netscaler Application Delivery Controller All All All All
Application Citrix Netscaler Gateway All All All All

References

ReferenceSourceLinkTags
NetScaler ADC and NetScaler Gateway Security Bulletin for CVE-2023-6548 and CVE-2023-6549 support.citrix.com Vendor Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
CISA Known Exploited Vulnerabilities catalog CISA www.cisa.gov kev

Legacy QID Mappings

  • 150807 NetScaler Application Delivery Controller (ADC) and NetScaler Gateway Multiple Vulnerabilities (CTX584986)
  • 379265 Citrix Application Delivery Controller (ADC) and Citrix Gateway Multiple Vulnerabilities (CTX584986)
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