Common Vulnerabilities and Exposures assigned an identifier CVE-2008-1333 to the following vulnerability:

Asterisk Project Security Advisory - AST-2008-004

Logging messages displayed using the ast_verbose logging API call are not
displayed as a character string, they are displayed as a format string.

Output as a result of the Manager command “command” is not appended to the
resulting response message as a character string, it is appended as a format
string.

It is possible in both instances for an attacker to provide a formatted string
as a value for input which can cause a crash.

References:
http://downloads.digium.com/pub/security/AST-2008-004.html