The ValidateUserLogon function in provider/libserver/ECSession.cpp in Zarafa 7.1.8, 6.20.0, and earlier, when using certain build conditions, allows remote attackers to cause a denial of service (crash) via vectors related to "a NULL pointer of the password."
Improper Input Validation The product receives input or data, but it does
not validate or incorrectly validates that the input has the
properties that are required to process the data safely and
correctly.