Juniper Junos 12.1X46 before 12.1X46-D20 and 12.1X47 before 12.1X47-D10 on SRX Series devices allows remote attackers to cause a denial of service (flowd crash) via a crafted SIP packet.
https://kb.juniper.net/InfoCenter/index?page=content&id=JSA10633
https://euvd.enisa.europa.eu/vulnerability/EUVD-2014-3753