This indicates an attack attempt to exploit a Buffer Overflow Vulnerability in Nostromo nhttpd.
The vulnerability is due to an improper boundary check condition in the application. A remote attacker may be able to exploit this to execute arbitrary code within the context of the application.
Nostromo nhttpd prior to 1.9.7
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor.