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Wireless & Mobility · Intermediate

Lightweight Extensible Authentication Protocol (LEAP)

A legacy Cisco proprietary EAP method using unprotected MS-CHAP that is vulnerable to dictionary attacks.

Definition

LEAP sends challenge and response without a tunnel, so tools such as asleap can crack passwords offline. Cisco recommended migrating to EAP-FAST or PEAP. It should not be used.

Exam tip

LEAP is insecure because its MS-CHAP exchange is not tunneled.

Related terms