Ubuntu Security Notice 946-1 – The SNMP server did not correctly validate certain UDP clients when using TCP wrappers. Under some situations, a remote attacker could bypass access restrictions and communicate with the SNMP server, potentially leading to a loss of privacy or a denial of service.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/90239/USN-946-1.txt
Source: https://packetstormsecurity.com/files/90239/Ubuntu-Security-Notice-946-1.html