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-B7DC4DDE-2E48-43F9-967A-C68461537CF2:
Aki Tuomi reports
Mail with group address as sender will cause a signal 11 crash in push
notification drivers. Group address as recipient can cause crash in some
drivers.
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– Scott Cheney, Manager of Information Security, Sierra View Medical Center