The c-client library in Internet Message Access Protocol (IMAP) dated before 2002 RC2, as used by Pine 4.20 through 4.44, allows remote attackers to cause a denial of service (client crash) via a MIME-encoded email with Content-Type header containing an empty boundary field.
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.