FreeBSD Security Advisory FreeBSD-SA-03:11.sendmail – Some versions of sendmail (8.12.0 through 8.12.8) contain a programming error in the code that implements DNS maps. A malformed DNS reply packet may cause sendmail to crash its child process and may lead to further possible exploitation.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/31577/FreeBSD-SA-03%3A11.sendmail
Source: https://packetstormsecurity.com/files/31577/FreeBSD-Security-Advisory-2003.11.html