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The VisNetic AntiVirus Plug-in (DKAVUpSch.exe) for Mail Server 4.6.0.4, 4.6.1.1, and possibly other versions before 4.6.1.2, does not drop privileges before executing other programs, which allows local users to gain privileges.
Buffer overflow in the Visnetic anti-virus plugin in Kerio MailServer before 6.5.0 might allow remote attackers to execute arbitrary code via unspecified vectors.