A missing bounds check was found in the way OpenSSL handled TLS heartbeat extension packets. This flaw could be used to reveal up to 64k of memory from a connected client or server.

Only 1.0.1 releases of OpenSSL are affected including 1.0.1f (and 1.0.2 betas)

The following upstream commit introduced TLS/DTLS heatbeat support and also this issue:

http://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=4817504

MiCollab 7.3 PR2 (7.3.0.204) and earlier, 7.2 (7.2.2.13) and earlier, and 7.1 (7.1.0.57) and earlier and MiCollab AWV 6.3 (6.3.0.103), 6.2 (6.2.2.8), 6.1 (6.1.0.28), 6.0 (6.0.0.61), and 5.0 (5.0.5.7) have a Command Execution Vulnerability. Successful exploit of this vulnerability could allow an attacker to execute arbitrary system commands.