ucbmail allows remote attackers to execute commands via shell metacharacters that are passed to it from INN.

Linux xmonisdn package allows local users to gain root privileges by modifying the IFS or PATH environmental variables.

Buffer overflow in nnrpd program in INN up to version 1.6 allows remote users to execute arbitrary commands.

Remote access in AIX innd 1.5.1, using control messages.

Buffer overflow in INN 2.2.1 and earlier allows remote attackers to cause a denial of service via a maliciously formatted article.

The STARTTLS implementation in nnrpd in INN before 2.5.3 does not properly restrict I/O buffering, which allows man-in-the-middle attackers to insert commands into encrypted sessions by sending a cleartext command that is processed after TLS is in place, related to a "plaintext command injection" attack, a similar issue to CVE-2011-0411.