Details for this vulnerability have not been published by NIST at this point. Descriptions from software vendor advisories for this issue are provided below.
From VID-DC132C91-2B71-11EB-8CFD-4437E6AD11C4:
Kevin J. McCarthy reports:
Mutt had incorrect error handling when initially connecting to an IMAP
server, which could result in an attempt to authenticate without enabling TLS.
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