Multiple buffer overflows in (a) BarnOwl before 1.0.5 and (b) owl 2.1.11 allow remote attackers to execute arbitrary code via vectors involving (1) a crafted zcrypt message, related to zcrypt.c; (2) a reply command on a message with a Zephyr Cc: list, related to zwrite.c; and unspecified other use of the products.
https://exchange.xforce.ibmcloud.com/vulnerabilities/48824
https://bugs.launchpad.net/ubuntu/+source/owl/+bug/329165
http://www.mail-archive.com/debian-testing-security-announce%40lists.debian.org/msg00173.html