CVE WatchJul 31, 2026

CVE-2023-4966

Citrix NetScaler ADC and NetScaler Gateway Buffer Overflow Vulnerability

CVSS

9.4

Critical

EPSS

100.0%

p100

KEV

YES

Oct 18, 2023

Exploit Today

0-100

Published: Oct 10, 2023 · Last modified: Jul 31, 2026 · CWE-119

EPSS · 30d

100.0%EPSS · 30 days100.0%

2026-09-162026-10-14

KEV catalog record

Product

Citrix / NetScaler ADC and NetScaler Gateway

Vulnerability

Citrix NetScaler ADC and NetScaler Gateway Buffer Overflow Vulnerability

Added to KEV

Oct 18, 2023

Remediate by

Nov 8, 2023

Known ransomware use

Yes

Summary description

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.

Required action

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.

Notes

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

Technical description

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.

Official references

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