Munin::Master::Node in Munin before 2.0.18 allows remote attackers to cause a denial of service (abort data collection for node) via a plugin that uses "multigraph" as a multigraph service name.

The get_group_tree function in lib/Munin/Master/HTMLConfig.pm in Munin before 2.0.18 allows remote nodes to cause a denial of service (infinite loop and memory consumption in the munin-html process) via crafted multigraph data.

munin-cgi-graph in Munin before 2.0.6, when running as a CGI module under Apache, allows remote attackers to load new configurations and create files in arbitrary directories via the logdir command.

Munin before 2.0.6 stores plugin state files that run as root in the same group-writable directory as non-root plugins, which allows local users to execute arbitrary code by replacing a state file, as demonstrated using the smart_ plugin.