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Cisco ASA/FTD Zero-Day Flaw Enables Unauthenticated DoS on SSL VPN

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A actively exploited vulnerability, tracked as CVE-2026-20349, affects Cisco ASA and FTD appliances, allowing unauthenticated attackers to crash the Remote Access SSL VPN service. When the firewall goes down, logging and policy enforcement stop, creating a window for malicious traffic to pass undetected. Enterprises are exposed to risks including lateral movement, loss of network visibility, and potential compliance violations. Cisco has released a patch, and administrators are advised to apply it promptly alongside hardening measures such as blocking untrusted IPs, enforcing multi-factor authentication, and segmenting VPN endpoints from critical assets. Security teams are also encouraged to monitor for anomalous traffic patterns and conduct regular DoS simulation exercises against perimeter devices.

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