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OpenSSL clients are vulnerable in all versions of OpenSSL before the versions 0.9.8za, 1.0.0m and 1.0.1h. Servers are only known to be vulnerable in OpenSSL 1.0.1 and 1.0.2-beta1. Users of OpenSSL servers earlier than 1.0.1 are advised to upgrade as a precaution. [82]
A workaround for SSL 3.0 and TLS 1.0, roughly equivalent to random IVs from TLS 1.1, was widely adopted by many implementations in late 2011. [30] In 2014, the POODLE vulnerability of SSL 3.0 was discovered, which takes advantage of the known vulnerabilities in CBC, and an insecure fallback negotiation used in browsers.
TLS 1.0 (deprecated) TLS 1.1 (deprecated) TLS 1.2 TLS 1.3 EV certificate SHA-2 certificate ECDSA certificate BEAST CRIME POODLE (SSLv3) RC4 FREAK Logjam Protocol selection by user Microsoft Edge (Chromium-based) OS-independent: 79–83 Windows (10+) macOS (11+) Linux Android (8.0+) iOS (16+) No No Yes Yes Yes Yes Yes Yes Yes Mitigated Not affected
In September 2018, the popular OpenSSL project released version 1.1.1 of its library, in which support for TLS 1.3 was "the headline new feature". [62] Support for TLS 1.3 was added to Secure Channel (schannel) for the GA releases of Windows 11 and Windows Server 2022. [63]
The affected versions of OpenSSL are OpenSSL 1.0.1 through 1.0.1f (inclusive). Subsequent versions (1.0.1g [70] and later) and previous versions (1.0.0 branch and older) are not vulnerable. [71] Installations of the affected versions are vulnerable unless OpenSSL was compiled with -DOPENSSL_NO_HEARTBEATS. [72] [73]
API v1 specification was published on April 12, 2016. It supports issuing certificates for fully-qualified domain names, such as example.com or cluster.example.com, but not wildcards like *.example.com. Let's Encrypt turned off API v1 support on 1 June 2021. [11]
LibreSSL is an open-source implementation of the Transport Layer Security (TLS) protocol. The implementation is named after Secure Sockets Layer (SSL), the deprecated predecessor of TLS, for which support was removed in release 2.3.0.
TLS 1.2 is the most prevalent version of TLS. The newest version of TLS (TLS 1.3) includes additional requirements to cipher suites. Cipher suites defined for TLS 1.2 cannot be used in TLS 1.3, and vice versa, unless otherwise stated in their definition. A reference list of named cipher suites is provided in the TLS Cipher Suite Registry. [4]