Technical Cyber Security Alert TA08-162A – A vulnerability in the way implementations of SNMPv3 handle specially crafted packets may allow authentication bypass. This vulnerability allows attackers to read and modify any SNMP object that can be accessed using the authentication credentials that got them into the system. Attackers exploiting this vulnerability can view and modify the configuration of these devices. Attackers must gain access using credentials with write privileges in order to modify configurations.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/67120/TA08-162A.txt
Source: https://packetstormsecurity.com/files/67120/Technical-Cyber-Security-Alert-2008-162A.html