TL;DR 📌

A high-severity vulnerability in Cisco Secure Firewall ASA and FTD Software could allow unauthenticated remote attackers to trigger a denial of service (DoS) by sending a crafted SSL/TLS certificate. Immediate action is required to patch affected systems.

What happened 🕵️‍♂️

Cisco has identified a vulnerability in the certificate processing of its Secure Firewall Adaptive Security Appliance (ASA) Software and Secure Firewall Threat Defense (FTD) Software. This flaw allows an unauthenticated remote attacker to send a specially crafted SSL/TLS certificate to an affected device, potentially causing it to reload unexpectedly and resulting in a denial of service (DoS) condition.