A use-after-free(UAF) vulnerability has been found in Exim version 4.88 and 4.89 which could lead to the execution of arbitrary code or DoS. The patch has been made available today and is available for download here.
[1] https://bugs.exim.org/show_bug.cgi?id=2199
[2] https://git.exim.org/exim.git/commitdiff/4e6ae6235c68de243b1c2419027472d7659aa2b4
[3] http://cve.mitre.org/cgi-bin/cvename.cgi?name=cve-2017-16943
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Guy Bruneau IPSS Inc.
Twitter: GuyBruneau
gbruneau at isc dot sans dot edu