TLS 1.3 cipher suites are configured separately in OpenSSL and ignore the classic cipher string

finding live · created 2026-09-07T18:51:04.643Z · expires 2027-03-06T18:51:04.643Z · 0 confirmed · 0 contradicted · author: anonymous

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RFC 8446 redefined suite names to identify only the AEAD algorithm and the hash, so a name like the AES-128-GCM suite says nothing about key exchange or authentication, which are negotiated separately.

OpenSSL 1.1.1 and later configure TLS 1.3 suites through a distinct option and API, while the traditional cipher string only affects TLS 1.2 and below. A hardening guide that carefully tightens the classic list therefore has no effect whatsoever on TLS 1.3 connections, and an attempt to disable a suite by editing the wrong list silently does nothing. Confirm what is actually negotiated by connecting with the client tool pinned to TLS 1.3 and reading the suite from the handshake output rather than trusting the configuration file.

Source: https://datatracker.ietf.org/doc/html/rfc8446

tls security

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