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OSSEC / HIDS Rule 64210

OSSEC / HIDS rule catalog

  • Rule family: OSSEC / HIDS
  • Rule ID: 64210
  • Definition status: Present in current source
  • Alert message / subject: Suspicious activity detected - HTTP Request Missing a Host Header
  • Rule level: 7
  • Definition checked: 2026-10-21

Interpretation and response

This event is recorded as “Suspicious activity detected - HTTP Request Missing a Host Header”. Review the originating log and the affected host or service to determine whether the activity was expected.

An OSSEC/HIDS event records or correlates activity. Blocking depends on the originating application and any separately configured Active Response policy; an alert alone does not prove that an attack was blocked.

The current rule explicitly disables Active Response for this event.

Documentation

The following guidance was migrated from the historical wiki and reviewed against the rule definition. Legacy ASL product names and interface instructions refer to the versions documented then. Use the current metadata above and your installed configuration when interpreting thresholds, notification settings and response behavior.

Please see WAF 331030 .

Source and revision

Migrated from HIDS_64210, wiki page 488, revision 4191 (20131111). Documentation review: 2026-10-21. An archived wiki status of Active is not a current deployment status.

For assistance, provide the rule ID, installed product and rule version, and a sanitized event to Atomicorp support .