Save time when penetration testing by easily searching all vulnerability databases at the same time. There are more details in this blog post.
First check CVEDetails and Exploit-DB.
The following resources are included:
CVE Details, Exploit-DB, CERT, MITRE, NIST, SecurityFocus, ExploitHub, PacketStorm, Secunia, Defcon, Blackhat, SecurityTube, Rapid7, Metasploit, WPVulnDB, osvdb.info, LWN vulnerabilities (Linux Weekly News), SensioLabs, Tenable (Nessus), Varutra MVD (Mobile Vulnerability Database), and VulnerabilityCenter.