Sircd v0.4.0 and below and v0.4.4 from CVS before 04/02-03 contains buffer overflow vulnerabilities which allow remote users to execute arbitrary code. Exploit available here.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/30849/sircd.txt
Source: https://packetstormsecurity.com/files/30849/sircd.txt.html