CVE-2017-16943: exim: use-after-free in receive_msg function via vectors involving BDAT commands

Severity: Critical

CVSS Score: 9.8

The receive_msg function in receive.c in the SMTP daemon in Exim 4.88 and 4.89 allows remote attackers to execute arbitrary code or cause a denial of service (use-after-free) via vectors involving BDAT commands.