The NTT DOCOMO sp mode mail application 5400 and earlier for Android does not properly verify X.509 certificates from SSL servers, which allows man-in-the-middle attackers to spoof servers and obtain sensitive information via a crafted certificate.
https://exchange.xforce.ibmcloud.com/vulnerabilities/75159
http://www.securityfocus.com/bid/53254
http://secunia.com/advisories/48955