> For the complete documentation index, see [llms.txt](https://cortex-docs.paloaltonetworks.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://cortex-docs.paloaltonetworks.com/appsec-rules/iac-security/compute/appsec-aws-115.md).

# 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]

***

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


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