A recent twitter post reveals the existence of an exploit for Postfix, in a collection of what appear to be NSA tools.
https://twitter.com/JulianAssange/status/850870683831648256 This is an exploit for Postfix 2.0 - 2.2, for a bug that was fixed 11 years ago in Postfix 2.2.11 and later. There was a memory corruption bug in a Postfix workaround for a Sendmail bug (CERT advisory CA-2003-07, remote buffer overflow when message headers contain lots of comment text before an email address). Technical details: the Postfix strip_address() function, which removes large comments from a mail header, called the printable() function on a string that wasn't null-terminated. This caused the printable() function to scribble past the end of malloc()ed memory, corrupting the memory heap. Running the exploit against Postfix versions less than 11 years old results in odd-looking email messages in the super-user's mailbox, and warning messages in the maillog file (warning: stripping too many comments from address: <long character string>). Wietse