Hackers Scanning Cisco ASA Devices to Exploit Vulnerabilities from 25,000 IPs

An unprecedented surge in malicious scanning activity targeting Cisco Adaptive Security Appliances (ASAs) occurred in late August 2025, with over 25,000 unique IP addresses participating in coordinated reconnaissance efforts. GreyNoise, a threat intelligence company, observed two distinct scanning waves that represent a dramatic escalation from the typical baseline activity of fewer than 500 IPs per […]

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