The encryption-processing feature in Cisco libSRTP before 1.5.3 allows remote attackers to cause a denial of service via crafted fields in SRTP packets, aka Bug ID CSCux00686.
http://www.securitytracker.com/id/1035652
http://www.securitytracker.com/id/1035651
http://www.securitytracker.com/id/1035650
http://www.securitytracker.com/id/1035649
http://www.securitytracker.com/id/1035648
http://www.securitytracker.com/id/1035637
http://www.securitytracker.com/id/1035636
http://www.debian.org/security/2016/dsa-3539
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160420-libsrtp