Net-SNMP before 5.0.9 allows a user or community to access data in MIB objects, even if that data is not allowed to be viewed.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9802
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A869
http://www.redhat.com/support/errata/RHSA-2004-023.html
http://www.redhat.com/support/errata/RHSA-2003-335.html
http://sourceforge.net/forum/forum.php?forum_id=308015
http://distro.conectiva.com.br/atualizacoes/?id=a&anuncio=000778