GNU Bash CVE-2014-6271 attack

I am running Subsonic 4.9 on a Windows 2008 server and have Symantec Endpoint Protection 12 for virus protection.
About 20-30 times a day, i see this pop up (message below). The traffic is blocked, but I'm wondering if htis is legit or if I should continue to block. Just wanted to see if anyone else noticed this on their subsonic servers.
[SID: 27907] OS Attack: GNU Bash CVE-2014-6271 attack blocked. Traffic has been blocked for this application: \DEVICE\HARDDISKVOLUME2\PROGRAM FILES (X86)\SUBSONIC\SUBSONIC-SERVICE.EXE
About 20-30 times a day, i see this pop up (message below). The traffic is blocked, but I'm wondering if htis is legit or if I should continue to block. Just wanted to see if anyone else noticed this on their subsonic servers.
[SID: 27907] OS Attack: GNU Bash CVE-2014-6271 attack blocked. Traffic has been blocked for this application: \DEVICE\HARDDISKVOLUME2\PROGRAM FILES (X86)\SUBSONIC\SUBSONIC-SERVICE.EXE