Success Stories

Technology: Citrix NetScaler

NetScaler Operations in the Financial Sector: Applying Patches Under Time Pressure

September 3, 2026

Lifecycle and security management for NetScaler environments at an IT service provider in the financial sector, since 2021.

Background

NetScaler occupies a prominent position in the network: as an access point for applications and load balancing. In Germany alone, several thousand appliances are accessible from the Internet, and the platform is consequently a prime target for attackers. Several vulnerabilities discovered in recent years were actively exploited before the majority of operators had applied patches. The BSI has repeatedly issued cybersecurity warnings regarding this issue.

WAF operation with automated rule generation

September 3, 2026

Managed service for operating a web application firewall on Citrix NetScaler in the banking sector, since 2020.

Background

The real effort involved in operating a WAF lies not in troubleshooting, but in managing the rules. Each release of the protected application can render rules invalid or require new ones. If this is maintained manually, adjustments take weeks, false positives are corrected during operation, and, when in doubt, security measures are relaxed to avoid blocking business processes.