FortiOS 5.0.x before 5.0.12 and 5.2.x before 5.2.4 supports anonymous, export, RC4, and possibly other weak ciphers when using TLS to connect to FortiGuard servers, which allows man-in-the-middle attackers to spoof TLS content by modifying packets.
Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-2323
Reference (s):
- http://fortiguard.com/advisory/2015-07-24-weak-ciphers-suites-are-presented-towards-fortiguard-servers
- http://www.fortiguard.com/advisory/FG-IR-15-021/
- SECTRACK:1033092
- URL: http://www.securitytracker.com/id/1033092