Heap-based buffer underflow in axigen 1.2.6 through 2.0.0b1 allows remote attackers to cause a denial of service (application crash) and possibly execute arbitrary code via certain base64-encoded data on the pop3 port (110/tcp), which triggers an integer overflow.
https://www.exploit-db.com/exploits/3289
https://exchange.xforce.ibmcloud.com/vulnerabilities/32342
http://www.securityfocus.com/bid/22473