This indicates an attack attempt to exploit a Denial of Service vulnerability in DomsHttpd.
The vulnerability is due to insufficient sanitizing of user supplied inputs in the application when handling an overly HTTP Referer field. A remote attacker may be able to exploit this to cause a denial of service condition on the affected system.
Denial of Service: Remote attackers can crash vulnerable systems.
Currently we are unaware of any vendor supplied patch or updates available for this issue.