Configure a minimum TLS version for secure communication between the client application and the storage account. To minimize security risk, the recommended minimum TLS version is the latest released version, which is currently TLS 1.2.
CIS Microsoft Azure Foundations Benchmark recommendation 3.15
Ensure the "Minimum TLS version" for storage accounts is set to "Version 1.2"
When set to TLS 1.2 all requests must leverage this version of the protocol. Applications leveraging legacy versions of the protocol will fail.
In some cases, Azure Storage sets the minimum TLS version to be version 1.0 by default. TLS 1.0 is a legacy version and has known vulnerabilities. This minimum TLS version can be configured to be later protocols such as TLS 1.2.
TLS 1.0 has known vulnerabilities and has been replaced by later versions of the TLS protocol. Continued use of this legacy protocol affects the security of data in transit.