FreeSWITCH through 1.8.2, when modxmlrpc is enabled, allows remote attackers to execute arbitrary commands via the api/system or txtapi/system (or api/bgsystem or txtapi/bgsystem) query string on TCP port 8080, as demonstrated by an api/system?calc URI. This can also be exploited via CSRF. Alternatively, the default password of works for the freeswitch account can sometimes be used.