CVE-2025-5777: Citrix NetScaler ADC and Gateway Out-of-Bounds Read

Citrix NetScaler ADC and Gateway Out-of-Bounds Read Vulnerability. Citrix NetScaler ADC and Gateway contain an out-of-bounds read vulnerability due to insufficient input validation. This vulnerability can lead to memory overread when the NetScaler is configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) OR AAA virtual server.

• CISA KEV-listed (remediation due 2025-07-11)
• used in ransomware campaigns
• EPSS 65.0% (98.5% percentile)

Related briefings

• Salt Typhoon Targets European Telecom: CVE-2025-5777 Citrix NetScaler Exploit, SNAPPYBEE/Deed RAT via Antivirus DLL Sideloading, and Dual HTTP/TCP C2 via LightNode VPS 2026-02-16

Browse the CVE database

Read the full analysis on IntelFusions