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.
tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160420-libsrtp
www.debian.org/security/2016/dsa-3539
www.securitytracker.com/id/1035636
www.securitytracker.com/id/1035637
www.securitytracker.com/id/1035648
www.securitytracker.com/id/1035649
www.securitytracker.com/id/1035650
www.securitytracker.com/id/1035651
www.securitytracker.com/id/1035652