The IMAP server in Softalk Mail Server (formerly WorkgroupMail) 8.5.1.431 allows remote authenticated users to cause a denial of service (resource consumption and daemon crash) via a long IMAP APPEND command with certain repeated parameters.
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.