48+ Cisco Firewalls Hit by Actively Exploited 0-Day Vulnerability
Cisco has confirmed two serious vulnerabilities impacting its Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) firewalls. Tracked as CVE-2025-20333 and CVE-2025-20362, both issues allow attackers to run arbitrary code on unpatched devices. Cisco security advisories warn that exploits for both flaws are already in the wild. Shadowserver’s daily vulnerable HTTP report now includes a live list of ASA/FTD instances susceptible to these 0-day bugs. On September 29, security researchers discovered 48,800+ publicly reachable IPs still running outdated firewall versions. Network teams should subscribe for daily updates and cross-check their public IP ranges against Shadowserver’s list.









