OpenSSL Security Advisory

• CVE-2021-23841 : Null pointer deref in X509_issuer_and_serial_hash()

• CVE-2021-23839 : Incorrect SSLv2 rollback protection

• CVE-2021-23840 : Integer overflow in CipherUpdate

https://mta.openssl.org/pipermail/openssl-announce/2021-February/000193.html