cgi-bin/munin-cgi-graph in Munin 2.x writes data to a log file without sanitizing non-printable characters, which might allow user-assisted remote attackers to inject terminal emulator escape sequences and execute arbitrary commands or delete arbitrary files via a crafted HTTP request.
https://support.citrix.com/article/CTX236992
https://exchange.xforce.ibmcloud.com/vulnerabilities/74885
http://www.openwall.com/lists/oss-security/2012/04/16/6