CVE Watch31 jul 2026

CVE-2023-4966

Citrix NetScaler ADC and NetScaler Gateway Buffer Overflow Vulnerability

CVSS

9.4

Crítico

EPSS

100.0%

p100

KEV

SÍ

18 oct 2023

Exploit Today

0-100

Publicado: 10 oct 2023 · Última mod.: 31 jul 2026 · CWE-119

EPSS · 30d

100.0%EPSS · 30 días100.0%

2026-08-022026-08-30

Ficha del catálogo KEV

Producto

Citrix / NetScaler ADC and NetScaler Gateway

Vulnerabilidad

Citrix NetScaler ADC and NetScaler Gateway Buffer Overflow Vulnerability

Añadido a KEV

18 oct 2023

Remediar antes de

8 nov 2023

Uso conocido en ransomware

Sí

Descripción resumida

Citrix NetScaler ADC and NetScaler Gateway contain a buffer overflow vulnerability that allows for sensitive information disclosure when configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) or AAA virtual server.

Acción requerida

Apply mitigations and kill all active and persistent sessions per vendor instructions [https://www.netscaler.com/blog/news/cve-2023-4966-critical-security-update-now-available-for-netscaler-adc-and-netscaler-gateway/] OR discontinue use of the product if mitigations are unavailable.

Notas

https://www.netscaler.com/blog/news/cve-2023-4966-critical-security-update-now-available-for-netscaler-adc-and-netscaler-gateway/, https://support.citrix.com/article/CTX579459/netscaler-adc-and-netscaler-gateway-security-bulletin-for-cve20234966-and-cve20234967 ; https://nvd.nist.gov/vuln/detail/CVE-2023-4966

Descripción técnica

Sensitive information disclosure in NetScaler ADC and NetScaler Gateway when configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) or AAA  virtual server.

Referencias oficiales

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