CVE-2025-7775: Citrix NetScaler Memory Overflow Vulnerability

Critical severity, CVSS 9.8. Actively exploited: in CISA KEV since 2025-08-26. EPSS: 20.3% chance of exploitation in the next 30 days.

Memory overflow vulnerability leading to Remote Code Execution and/or Denial of Service in NetScaler ADC and NetScaler Gateway when NetScaler is configured as Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) or AAA virtual server (OR) NetScaler ADC and NetScaler Gateway 13.1, 14.1, 13.1-FIPS and NDcPP: LB virtual servers of type (HTTP, SSL or HTTP_QUIC) bound with IPv6 services or servicegroups bound with IPv6 servers (OR) NetScaler ADC and NetScaler Gateway 13.1, 14.1, 13.1-FIPS and NDcPP: LB virtual servers of type (HTTP, SSL or HTTP_QUIC) bound with DBS IPv6 services or servicegroups bound with IPv6 DBS servers (OR) CR virtual server with type HDX

Affected products

• Citrix NetScaler Application Delivery Controller: from 12.1, before 12.1-55.330 (fixed in 12.1-55.330); from 13.1, before 13.1-37.241 (fixed in 13.1-37.241); from 13.1, before 13.1-59.22 (fixed in 13.1-59.22); from 14.1, before 14.1-47.48 (fixed in 14.1-47.48)
• Citrix NetScaler Gateway: from 13.1, before 13.1-59.22 (fixed in 13.1-59.22); from 14.1, before 14.1-47.48 (fixed in 14.1-47.48)

Published 2025-08-26. Last modified 2026-06-17.