Findings

AWS ALB has WAF set to fail open

Updated: June 19, 2025

Description

AWS Application Load Balancer (ALB) has a WAF that is set to fail open if the WAF is unavailable.

Remediation

Ensure that this behaviour is in accordance with your security policies or set the AWS WAF to not fail open.

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AWS ALB has insecure desync mitigation mode
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AWS ALB is missing WAF