Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software SSL/TLS Client Denial of Service Vulnerability [CVE-2022-20927]

CVE number CVE-2022-20927

A vulnerability in the SSL/TLS client of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an authenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.

This vulnerability is due to improper memory management when a device initiates SSL/TLS connections. An attacker could exploit this vulnerability by ensuring that the device will connect to an SSL/TLS server that is using specific encryption parameters. A successful exploit could allow the attacker to cause the affected device to unexpectedly reload, resulting in a DoS condition.

Cisco has released free software updates that address the vulnerability described in this advisory. Customers with service contracts that entitle them to regular software updates should obtain security fixes through their usual update channels.

Vulnerable Products

This vulnerability affects the following Cisco products if they are running a vulnerable release of Cisco ASA Software or Cisco FTD Software:

• ASA 5500-X Series
• Firepower 4100 Series
• Firepower 9300 Series

Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ssl-client-dos-cCrQPkA