Vulnerability Scanning
A vulnerability is a bug in in an application program that affects security. They are made public on places such as the BugTraq and the Full-Disclosure mailing lists. The Computer Emergency Response Team (CERT) brings out a statistical report every year. There were 8064 vulnerabilities counted in 2006 alone.
Vulnerability scanning is determining whether known vulnerabilities are present on a target.
Read more about this topic: Cracking Of Wireless Networks