CMAKE_TLS_VERSION

Added in version 3.30.

Specify the default value for the file(DOWNLOAD) and file(UPLOAD) commands' TLS_VERSION option. If this variable is not set, the commands check the CMAKE_TLS_VERSION environment variable. If neither is set, the default is TLS 1.2.

Changed in version 3.31: The default is TLS 1.2. Previously, no minimum version was enforced by default.

The value may be one of:

1.0
1.1
1.2
1.3

This variable is also used by the ExternalProject and FetchContent modules for internal calls to file(DOWNLOAD) and git clone.

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Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/latest/variable/CMAKE_TLS_VERSION.html