T1499.003 Application Exhaustion Flood

This control describes how CSPs and CSCs must install, update, and properly configure endpoint and software-defined firewalls, regularly review and approve firewall rule changes, and monitor traffic for anomalies and malicious code. These mitigative actions help prevent unauthorized access, block threats, and ensure only approved firewall rules are active.

Adversaries may target resource intensive features of applications to cause a denial of service (DoS), denying availability to those applications. For example, specific features in web applications may be highly resource intensive. Repeated requests to those features may be able to exhaust system resources and deny access to the application or the server itself. This control establishes and regularly evaluates processes, procedures, and technical measures to ensure continuous operations of the datacenter, mitigating attacker techniques such as denial‑of‑service and other availability‑impacting attacks that seek to disrupt business and operational continuity.

Adversaries may target resource intensive features of applications to cause a denial of service (DoS), denying availability to those applications. For example, specific features in web applications may be highly resource intensive. Repeated requests to those features may be able to exhaust system resources and deny access to the application or the server itself. The control outlines several testing approaches, including the use of automated tools, to identify and remediate vulnerabilities or weaknesses that can be exploited such as the use of the application exhaustion flood technique to exhaust system resources and deny access to the web application for others.