CVE-2013-4786 is a weakness in IPMI 2.0 authentication, specifically in the RAKP session setup used by many Baseboard Management Controllers (BMCs). In affected implementations, the login handshake can leak password-derived material, such as an HMAC based on the user’s secret, before authentication finishes. That does not immediately reveal the password, but it can give an attacker enough data to test guesses offline.
This matters because IPMI is used for out-of-band server management, often with powerful control over power, boot, and console access. If the management interface is exposed to untrusted networks, CVE-2013-4786 can turn a remote login attempt into a password-cracking opportunity without repeated contact with the target. Defenders reduce the risk by isolating BMC access on dedicated management networks, restricting exposure with VPN or bastions, using unique credentials, and disabling legacy IPMI features where possible.