Multiple vulnerabilities exist in the Cisco ASA 5500 Series Adaptive Security Appliances and Cisco PIX Security Appliances. This security advisory outlines details of these vulnerabilities:

Windows NT Domain Authentication Bypass Vulnerability
IPv6 Denial of Service Vulnerability
Crypto Accelerator Memory Leak Vulnerability

A vulnerability exists in Cisco Unity that could allow an unauthenticated user to view or modify some of the configuration parameters of the Cisco Unity server. Cisco has released free software updates that address this vulnerability. A workaround that mitigates this vulnerability is available.
Vulnerable Products
All Cisco Unity versions, 4.x, 5.x and 7.x, may be affected [...]

On September 24, 2008, at about 16:00 GMT, the The Cisco Product Security Incident Response Team (PSIRT) has published 12 new vulnerability advisories. Mainly these vulnerabilities are DOS attack.