Apache mod_auth_radius 1.5.4 and libpam-radius-auth allow remote malicious RADIUS servers to cause a denial of service (crash) via a RADIUS_REPLY_MESSAGE with a RADIUS attribute length of 1, which leads to a memcpy operation with a -1 length argument.
https://exchange.xforce.ibmcloud.com/vulnerabilities/18841
http://www.securityfocus.com/bid/12217
http://securitytracker.com/id?1012829
http://secunia.com/advisories/14046