In an unprecedented move for the SSL/TLS ecosystem, the four major browsers have uniformly announced that they will deprecate TLS 1.0 and 1.1 starting in 2020.
The following browser vendors issued statements providing their deprecation plans:
The SSL/TLS protocol is made up of many versions: SSL 1.0, 2.0 and 3.0 plus TLS 1.0, 1.1, 1.2 and 1.3. The SSL 1.0 version was never deployed and over the last few years the industry has phased out the use of SSL 2.0 and 3.0.
Earlier this year TLS 1.3 was released per RFC 8446. TLS 1.3 is already supported by Chrome and Firefox and content delivery networks such as Akamai and Cloudflare. There are currently two secure versions of TLS (i.e., TLS 1.2 and 1.3) available, which allows for backwards compatibility and secure growth.
Telemetry from the browsers indicate that about 0.5 percent of HTTPS connections are still made using TLS 1.0 and 1.1. As such, the browsers have delayed deprecation until 2020. This will provide server administrators with the time needed to upgrade their systems to support TLS 1.2 and 1.3.