Conectiva Security Advisory CLA-2003:736 – Stunnel v3.25 and below is vulnerable to two denial of services attacks. A race condition exists in handling of the SIGCHLD signal and a file descriptor leak allows a local attacker to hijack the server.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/31599/CLA-2003%3A736
Source: https://packetstormsecurity.com/files/31599/CLA-2003-736.html