NetScaler ADC and Gateway
CVE-2025-5777: NetScaler ADC and NetScaler Gateway - Insufficient input validation leading to memory overread
Insufficient input validation leading to memory overread when the NetScaler is configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) OR AAA virtual server
Published
ExploitedYes, in CISA KEVAdded 10 Jul 2025
Ransomware useKnownPer CISA
SeverityCRITICALCVSS 4.0 9.3
EPSS100%Chance of exploitation in 30 days
Public exploitNot tracked
FixAvailable
Automatic summary from the vendor's CVE record. We haven't written a full analysis of this vulnerability yet.
Affected and fixed versions
| Product / branch | Fixed in |
|---|---|
| ADC 14.1 | 43.56 or later |
| ADC 13.1 | 58.32 or later |
| Gateway 14.1 | 43.56 or later |
| Gateway 13.1 | 58.32 or later |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
Insufficient input validation leading to memory overread when the NetScaler is configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) OR AAA virtual server
Exploitation
CISA lists this CVE as exploited in the wild since 10 Jul 2025, including in ransomware campaigns.
Sources
KEV status, EPSS score and vendor data refreshed automatically, last on 11 Oct 2026.