Some SNMP implementations include incomplete HMAC authentication code that allows spoofing of authenticated SNMPv3 packets. Net-SNMP versions equal and below 5.4.1, 5.3.2, and 5.2.4 are affected. All versions of eCos and UCD-SNMP are affected.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/67140/snmp-spoof.txt
Source: https://packetstormsecurity.com/files/67140/snmp-spoof.txt.html