CVE-2017-17549: Citrix Application Delivery Controller Firmware

Medium severity, CVSS 5.9. EPSS: 1.6% chance of exploitation in the next 30 days.

Citrix NetScaler Application Delivery Controller (ADC) and NetScaler Gateway 10.5 before build 67.13, 11.0 before build 71.22, 11.1 before build 56.19, and 12.0 before build 53.22 allow remote attackers to obtain sensitive information from the backend client TLS handshake by leveraging use of TLS with Client Certificates and a Diffie-Hellman Ephemeral (DHE) key exchange.

Affected products

• Citrix Application Delivery Controller Firmware: version 10.5 only; version 11.0 only; version 11.1 only; version 12.0 only
• Citrix NetScaler Gateway Firmware: version 10.5 only; version 11.0 only; version 11.1 only; version 12.0 only

Published 2017-12-13. Last modified 2026-06-17.