Key Findings Amazon's threat intelligence team observed an advanced persistent threat group exploiting zero-day vulnerabilities in Cisco Identity Service Engine (ISE) and Citrix NetScaler ADC products before the vendors disclosed and patched the issues. The attacks leveraged the following vulnerabilities: CVE-2025-5777 (CVSS score: 9.3) - An insufficient input validation vulnerability in Citrix NetScaler ADC and Gateway that could be exploited to bypass authentication. (Fixed
