This indicates an attack attempt to exploit a Remote Code Execution vulnerability in GNUTLS.
The vulnerability is due to an input validation error in the application when handling malformed data packets. A remote attacker may be able to exploit this to execute arbitrary code within the context of the application.
Free Software Foundation GnuTLS Prior to 2.12.18
Free Software Foundation GnuTLS Prior to 3.0.16
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor.