Cisco patches high-severity DTLS DoS flaw in Secure Firewall ASA and FTD
Cisco disclosed CVE-2026-20250, a high-severity DTLS denial-of-service vulnerability in Secure Firewall ASA and FTD software for Secure Firewall 3100 and 4200 Series devices. Improper resource management when processing certain DTLS messages lets an unauthenticated remote attacker send crafted DTLS traffic to reload the device. Cisco released software updates and workarounds.
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