If you’re using CloudFlare to host your DNS, there is a plugin for the official Let’s Encrypt client Certbot you can use to easily acquire and renew wildcard certificates from Let’s Encrypt.
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How CloudFlare handled CloudBleed
Tavis Ormandy from Google’s Project Zero contacted Cloudflare to report a security problem with their service. It turned out that in some unusual circumstances, they would bleed memory that contained private information.