This indicates an attempt to exploit a Buffer Overflow Vulnerability in Realtek eCos devices.
The vulnerability is caused by an error when the vulnerable software handles a crafted SIP packet that contains malicious SDP data. A remote attacker can exploit this vulnerability by sending specially crafted SDP data to the target server. Successful exploitation can lead to Denial-of-Service and likely remote code execution.
Realtek eCos RSDK 1.5.7p1
Realtek eCos MSDK 4.9.4p1
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor.