CVE-2009-3555 SSL deep-inspection support insecure renegotiation Fortinet PSIRT Advisories Fortinet PSIRT Contact: Website: https://fortiguard.fortinet.com/faq/psirt-contact FG-IR-17-137 Final 1 1 2017-11-03T00:00:00 Current version 2017-11-03T00:00:00 2017-11-03T00:00:00 FortiOS SSL Deep-Inspection may enable insecure renegotiation between TLS clients and servers that support secure renegotiation, opening the door to potential Man-in-the-Middle attacks (CVE-2009-3555) against the TLS connection, where an attacker could inject arbitrary data in the connection (without however being able to decipher it).The fix enables secure renegotiation on the SSL Deep-Inspection when both the client and server support it. Information disclosure FortiOS 5.6.0FortiOS 5.4.0 to 5.4.5FortiOS 5.2 and below Upgrade to FortiOS 5.4.6 or 5.6.1 CVE-2009-3555 7.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:U/RL:X/RC:X https://fortiguard.fortinet.com/psirt/FG-IR-17-137 CVE-2009-3555 SSL deep-inspection support insecure renegotiation Reference>