AWS Lambda function is not configured for function-level concurrent execution Limit misconfiguration

Rule Details

Cortex AppSec Rule ID	APPSEC_AWS_115
Category - Subcategory	Compute - Overprovisioned
Provider	AWS
Severity	LOW
Framework	CloudFormation, Terraform, Terraform Plan

Impact

Adding concurrency to Lambda initializes that number of execution environments for multiple parallel requests at low latency. However, this could spike costs and open the door for abuse. Adding concurrency limits can prevent a rapid spike in usage and costs, while also increasing or lowering the default concurrency limit.

How to Fix

Resource: AWS::Lambda::Function, AWS::Serverless::Function

• Arguments: Properties/ReservedConcurrentExecutions [source,go]

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Type: AWS::Lambda::Function Properties: ... ReservedConcurrentExecutions: 100 ...