Let’s Encrypt to revoke 3 million certificates that may have been issued wrongfully due to a bug in its Certificate Authority software. The bug impacted the way it checked the domain name ownership before issuing new certificates. The company said 2.6 percent of approximately 116 million active certificates are affected about 3,048,289 out of which about one million are duplicates of other affected certificates. Affected website owners have until 8PM UTC (3PM EST) March 4 to manually renew and replace their certificates, failing which visitors to the websites will be greeted with the certificates being revoked.
Source: https://thehackernews.com/2020/03/lets-encrypt-certificate-revocation.html