[gnutls-devel] GnuTLS | GnuTLS sends protocol_version alert when client message contains unrecognized version (#1230)

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Mon May 10 17:54:18 CEST 2021

Daiki Ueno commented:

It seems like debatable; RFC 8446 Appendix D.2 says:

> A TLS server can also receive a ClientHello indicating a version number smaller than its highest supported version. [...]

and later:

> If the "supported_versions" extension is absent and the server only supports versions greater than ClientHello.legacy_version, the server MUST abort the handshake with a "protocol_version" alert.

Therefore, in this occasion, the older client should be prepared for the servers sending a "protocol_version" alert anyway.

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