Redis Cache must use TLS 1.2 minimum

High Azure General redis-min-tls

Applies to

Microsoft.Cache/redis

What CGPulse checks

A resource passes this rule when minimumTlsVersion must be one of ["1.2","1.3"]. Anything else is reported as a finding with the evaluated property value attached as evidence.

How to fix it

Set minimum TLS version to 1.2 to prevent protocol downgrade attacks. In Azure Portal: Redis Cache > Advanced settings > set Minimum TLS version to 1.2. See: https://learn.microsoft.com/en-us/azure/azure-cache-for-redis/cache-remove-tls-10-11

CLI

az redis update --ids "{id}" --set minimumTlsVersion=1.2

Terraform

resource "azurerm_redis_cache" "{name}" {
  name                = "{name}"
  resource_group_name = "{rg}"
  location            = var.location
  capacity            = 1
  family              = "C"
  sku_name            = "Basic"
  minimum_tls_version = "1.2"
  # Match sku to your Redis tier (Basic/Standard/Premium)
}

Compliance frameworks

Vendor documentation

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