This indicates an attack attempt to exploit a buffer overflow vulnerability in Cisco Adaptive Security Appliance.
The vulnerability is due to insufficient sanitizing of user supplied inputs in the application. A remote attacker may be able to exploit this to execute arbitrary code within the context of the application, via a crafted request.
Cisco ASA 5500 Series Adaptive Security Appliances
Cisco ASA 5500-X Series Next-Generation Firewalls
Cisco ASA Services Module for Cisco Catalyst 6500 Series Switches and Cisco 7600 Series Routers
Cisco ASA 1000V Cloud Firewall
Cisco Adaptive Security Virtual Appliance (ASAv)
Cisco Firepower 4100 Series
Cisco Firepower 9300 ASA Security Module
Cisco Firepower Threat Defense Software
Cisco Firewall Services Module (FWSM)
Cisco Industrial Security Appliance 3000
Cisco PIX Firewalls
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor.