NetScaler ADC and Gateway
CVE-2025-6543: Memory overflow vulnerability leading to unintended control flow and Denial of Service
Memory overflow vulnerability leading to unintended control flow and Denial of Service in NetScaler ADC and NetScaler Gateway when configured as Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) OR AAA virtual server
Published
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 | 47.46 or later |
| ADC 13.1 | 59.19 or later |
| ADC 13.1 FIPS and NDcPP | 37.236 or later |
| Gateway 14.1 | 47.46 or later |
| Gateway 13.1 | 59.19 or later |
| Gateway 13.1 FIPS and NDcPP | 37.236 or later |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
Memory overflow vulnerability leading to unintended control flow and Denial of Service in NetScaler ADC and NetScaler Gateway when configured as Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) OR AAA virtual server
Exploitation
CISA lists this CVE as exploited in the wild since 30 Jun 2025.
Sources
KEV status, EPSS score and vendor data refreshed automatically, last on 11 Oct 2026.