Is there a difference between curl --tlsv1 and --tlsv1.0?

Question

The Curl man page lists -1 --tlsv1 and separately lists --tlsv1.0 along with v1.1 and v1.2.

The descriptions are:

-1, --tlsv1 (SSL) Forces curl to use TLS version 1 when negotiating with a remote TLS server.

And later:

--tlsv1.0 (SSL) Forces curl to use TLS version 1.0 when negotiating with a remote TLS server. (Added in 7.34.0)

Is there a difference between these tlsv1 and tlsv1.0 options?

Answer 1

If we look at the curl help code in github, we see

-1, --tlsv1 Use >= TLSv1 (SSL)

--tlsv1.0 Use TLSv1.0 (SSL)

--tlsv1.1 Use TLSv1.1 (SSL)

--tlsv1.2 Use TLSv1.2 (SSL)

Thus, --tlsv1 uses any of 1.0, 1.1, or 1.2, while the other three use a specific one.

For increased security, use --tlsv1.2 specifically.