This indicates an attack attempt to exploit a Null Pointer Dereference Vulnerability in Python SSL.
Remote attackers could exploit the vulnerability in server programs by sending a malicious client certificate, and in client programs by sending a malicious server certificate as part of the TLS handshake. In a successful attack, the attacker can cause a denial-of-service condition.
Python Software Foundation Python 2.7
Python Software Foundation Python 3.x
Denial of Service: Remote attackers can crash vulnerable systems.
Refer to the vendor supplied advisory for updates: