CVE-2020-27124: Cisco Adaptive Security Appliance Software

High severity, CVSS 8.6. EPSS: 0.9% chance of exploitation in the next 30 days.

A vulnerability in the SSL/TLS handler of Cisco Adaptive Security Appliance (ASA) Software could allow an unauthenticated, remote attacker to cause the affected device to reload unexpectedly, leading to a denial of service (DoS) condition. The vulnerability is due to improper error handling on established SSL/TLS connections. An attacker could exploit this vulnerability by establishing an SSL/TLS connection with the affected device and then sending a malicious SSL/TLS message within that connection. A successful exploit could allow the attacker to cause the device to reload.Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

Affected products

• Cisco Adaptive Security Appliance Software: version 9.13.1.12 only; version 9.13.1.13 only; version 9.14.1.10 only

Published 2024-11-18. Last modified 2026-06-17.