The IGMP implementation on Cisco Wireless LAN Controller (WLC) devices 4.x 5.x 6.x 7.0 before 7.0.250.0 7.1 7.2 and 7.3 when IGMPv3 Snooping is enabled allows remote attackers to cause a denial of service (memory over-read and device restart) via a crafted field in an IGMPv3 message aka Bug ID CSCuh33240.