Citrix Hypervisor uses netfilter/iptables firewalling. There are no specific frameworks or APIs for antivirus or firewall integration.
The fee-based Citrix ADC (formerly NetScaler) provides various (network) security related capabilities through e.g.
- Citrix Gateway: secure application and data access for Citrix XenApp, Citrix XenDesktop and Citrix XenMobile)
- Citrix AppFirewall: secures web applications, prevents inadvertent or intentional disclosure of confidential information and aids in compliance with information security regulations such as PCI-DSS. AppFirewall is available as a standalone security appliance or as a fully integrated module of the Citrix application delivery solution.
Details here: https://tinyurl.com/y26zjofl