The Ignite Realtime Smack XMPP API, as used in Atlassian Bamboo before 5.9.9 and 5.10.x before 5.10.0, allows remote configured XMPP servers to execute arbitrary Java code via serialized data in an XMPP message.
https://jira.atlassian.com/browse/BAM-17099
https://confluence.atlassian.com/bamboo/bamboo-security-advisory-2016-01-20-794376535.html
http://www.securityfocus.com/archive/1/537347/100/0/threaded