Recently new vulnerabilities like Zombie POODLE, GOLDENDOODLE, 0-Length OpenSSL and Sleeping POODLE were published for websites that use CBC (Cipher Block Chaining) block cipher modes. These vulnerabilities are applicable only if the server uses TLS 1.2 or TLS 1.1 or TLS 1.0 with CBC cipher modes.
SSL Labs identifies cipher suites using CBC with orange color and with text WEAK. This change won’t have any effect on the grades, as it only means that SSL Labs discourages the use of CBC-based cipher suites further.
SSL Labs will start giving “F” grade to the server affected by these vulnerabilities from end of May 2019. For now, SSL Labs will give only a warning for affected servers:
Update April 26, 2019: The warning is live on <https://dev.ssllabs.com/> and <https://www.ssllabs.com/>. As stated above, the grade change will be live by the end of May.