stunnel 4.0.3 and earlier allows attackers to cause a denial of service (crash) via SIGCHLD signal handler race conditions that cause an inconsistency in the child counter.
AV:L/AC:H/Au:N/C:N/I:N/A:P
This vulnerability has a 0.34% probability of being exploited in the next 30 days, ranking higher than 25% of all scored CVEs.