This indicates an attempt to exploit a Buffer Overflow vulnerability in OpenSSL.
The vulnerability is a result of errors in the "SSL_get_shared_ciphers()" function. An attacker with the ability to supply a specially crafted list of ciphers can execute code in the context of the application using the vulnerable function.
OpenSSL 0.9.7 before 0.9.7l
OpenSSL 0.9.8 before 0.9.8d, and earlier versions.
System Compromise: Remote attackers can gain control of vulnerable systems.
Upgrade to OpenSSL 0.9.8d or 0.9.7l, or to the most recent version.