TLS Versions
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The evolution of the TLS/SSL protocol — SSL 3.0 (deprecated), TLS 1.0 and 1.1 (deprecated since 2021), TLS 1.2 (current baseline supported everywhere), and TLS 1.3 (latest, mandatory for HTTP/3 and recommended for all new deployments). Older versions contain known vulnerabilities such as POODLE (SSL 3.0), BEAST (TLS 1.0), and LUCKY13 (TLS 1.1 and 1.2). Configuring servers to reject deprecated versions is a foundational security hardening step.