ICASI is releasing this alert to provide guidance on a protocol-level design flaw allows for an attacker to perform a man-in-the-middle (MITM) attack on sessions protected by Transport Layer Security (TLS) and Secure Sockets Layer (SSL). This vulnerability could allow an attacker who is able to successfully leverage a MITM attack to prepend data to an SSL/TLS-protected session. It does not allow the attacker to read, decrypt, or alter encrypted traffic between client and server.