Citrix NetScaler Memory Overflow Vulnerability. Actively exploited: CISA added this vulnerability to its Known Exploited Vulnerabilities catalog on 26/08/2025. Patch affected systems as an emergency.
| Package | Affected versions | Patched versions |
|---|---|---|
| netscaler application delivery controller | ≥ 12.1, < 12.1-55.330≥ 13.1, < 13.1-37.241≥ 13.1, < 13.1-59.22≥ 14.1, < 14.1-47.48 | 12.1-55.33013.1-37.24113.1-59.2214.1-47.48 |
| netscaler gateway | ≥ 13.1, < 13.1-59.22≥ 14.1, < 14.1-47.48 | 13.1-59.2214.1-47.48 |
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
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