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<a href="https://gitlab.com/tomato42">Hubert Kario (@mention me if you need reply)</a>
commented on a
<a href="https://gitlab.com/gnutls/gnutls/-/issues/1230#note_572903471">discussion</a>:
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<p dir="auto">Actually RFC 8446 is quite clear on this, see <a href="https://datatracker.ietf.org/doc/html/rfc8446#page-79" rel="nofollow noreferrer noopener" target="_blank">https://datatracker.ietf.org/doc/html/rfc8446#page-79</a>:</p>
<pre class="code highlight js-syntax-highlight language-plaintext" lang="plaintext" v-pre="true"><code><span id="LC1" class="line" lang="plaintext"> legacy_record_version: MUST be set to 0x0303 for all records</span>
<span id="LC2" class="line" lang="plaintext"> generated by a TLS 1.3 implementation other than an initial</span>
<span id="LC3" class="line" lang="plaintext"> ClientHello (i.e., one not generated after a HelloRetryRequest),</span>
<span id="LC4" class="line" lang="plaintext"> where it MAY also be 0x0301 for compatibility purposes. This</span>
<span id="LC5" class="line" lang="plaintext"> field is deprecated and MUST be ignored for all purposes.</span>
<span id="LC6" class="line" lang="plaintext"> Previous versions of TLS would use other values in this field</span>
<span id="LC7" class="line" lang="plaintext"> under some circumstances.</span></code></pre>
<p dir="auto">The key sentence being "MUST be ignored for all purposes".</p>
<p dir="auto">As such, the message should be parsed by GnuTLS as well-formed Alert, but since the client MUST send ClientHello as the first message, the GnuTLS server should abort with <code>unexpected_message</code>.</p>
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