Yesterday 3rd of May, it was released a set of OpenSSL vulnerabilities (2 of them with high severity) where a Man In The Middle attack could decrypt traffic when the SSL connection uses certain ciphers. More information here.
In detail, the vulnerabilities released and checked for Zen Load Balancer Editions are:
Memory corruption in the ASN.1 encoder (CVE-2016-2108) – Severity High
Padding oracle in AES-NI CBC MAC check (CVE-2016-2107) – Severity High