---
title: Function App not using latest TLS encryption version
description: Datadog, the leading service for cloud-scale monitoring.
breadcrumbs: >-
  Docs > Datadog Security > Code Security > Infrastructure as Code (IaC)
  Security > IaC Security Rules > Function App not using latest TLS encryption
  version
---

# Function App not using latest TLS encryption version

{% callout %}
# Important note for users on the following Datadog sites: app.ddog-gov.com, us2.ddog-gov.com

{% alert level="danger" %}
This product is not supported for your selected [Datadog site](https://docs.datadoghq.com/getting_started/site.md). ({% placeholder "user-datadog-site-name" /%}).
{% /alert %}

{% /callout %}

## Metadata{% #metadata %}

**Id:** `terraform-azure-function-app-not-using-latest-tls-encryption-version` 

**Provider:** Azure

**Platform:** Terraform

**Severity:** Medium

**Category:** Encryption

#### Learn More{% #learn-more %}

- [Provider Reference](https://registry.terraform.io/providers/hashicorp/azurerm/latest/docs/resources/function_app#min_tls_version)

### Description{% #description %}

Azure Function Apps should be configured to use the latest supported TLS version to ensure encrypted communications and protect data in transit. If the `min_tls_version` attribute is set to an outdated value such as `1.1`, as shown below, the application becomes susceptible to known TLS vulnerabilities and exploits:

```
site_config {
  min_tls_version = 1.1
}
```

To mitigate these risks and enforce stronger secure connections with clients, set `min_tls_version` to at least `1.2`, as shown here:

```
site_config {
  min_tls_version = 1.2
}
```

## Compliant Code Examples{% #compliant-code-examples %}

```terraform
resource "azurerm_function_app" "negative1" {
  name                       = "test-azure-functions"
  location                   = azurerm_resource_group.example.location
  resource_group_name        = azurerm_resource_group.example.name
  app_service_plan_id        = azurerm_app_service_plan.example.id
  storage_account_name       = azurerm_storage_account.example.name
  storage_account_access_key = azurerm_storage_account.example.primary_access_key

  site_config {
    dotnet_framework_version = "v4.0"
    scm_type                 = "LocalGit"
    min_tls_version = 1.2
  }
}
```

```terraform
resource "azurerm_function_app" "negative2" {
  name                       = "test-azure-functions"
  location                   = azurerm_resource_group.example.location
  resource_group_name        = azurerm_resource_group.example.name
  app_service_plan_id        = azurerm_app_service_plan.example.id
  storage_account_name       = azurerm_storage_account.example.name
  storage_account_access_key = azurerm_storage_account.example.primary_access_key

  site_config {
    dotnet_framework_version = "v4.0"
    scm_type                 = "LocalGit"
  }
}
```

```terraform
resource "azurerm_function_app" "negative3" {
  name                       = "test-azure-functions"
  location                   = azurerm_resource_group.example.location
  resource_group_name        = azurerm_resource_group.example.name
  app_service_plan_id        = azurerm_app_service_plan.example.id
  storage_account_name       = azurerm_storage_account.example.name
  storage_account_access_key = azurerm_storage_account.example.primary_access_key
}
```

## Non-Compliant Code Examples{% #non-compliant-code-examples %}

```terraform
resource "azurerm_function_app" "positive1" {
  name                       = "test-azure-functions"
  location                   = azurerm_resource_group.example.location
  resource_group_name        = azurerm_resource_group.example.name
  app_service_plan_id        = azurerm_app_service_plan.example.id
  storage_account_name       = azurerm_storage_account.example.name
  storage_account_access_key = azurerm_storage_account.example.primary_access_key

  site_config {
    dotnet_framework_version = "v4.0"
    scm_type                 = "LocalGit"
    min_tls_version = 1.1
  }
}
```

```terraform
resource "azurerm_function_app" "positive2" {
  name                       = "test-azure-functions"
  location                   = azurerm_resource_group.example.location
  resource_group_name        = azurerm_resource_group.example.name
  app_service_plan_id        = azurerm_app_service_plan.example.id
  storage_account_name       = azurerm_storage_account.example.name
  storage_account_access_key = azurerm_storage_account.example.primary_access_key

  site_config {
    dotnet_framework_version = "v4.0"
    scm_type                 = "LocalGit"
    min_tls_version = "1.1"
  }
}
```