It was discovered that SSL connections to the MRG broker could easily be blocked. If a client or application initiated a connection to the MRG broker's listening SSL port, the client connection would block access to the port until the SSL handshake completes (or fails). If a client failed to proceed with it, then the thread was never freed to process other connections, denying service to other clients. Only SSL connections were affected by this issue, and SSL support is not enabled by default.

A flaw was discovered in how the MRG broker handled the receipt of large persistent messages. If a remote authenticated user were to send a very large persistent message, the broker could exhaust stack memory, resulting in a segfault of the broker. Subsequent connections to the broker would fail until it was restarted.

The policy definition evaluator in Condor before 7.4.2 does not properly handle attributes in a WANTSUSPEND policy that evaluate to an UNDEFINED state, which allows remote authenticated users to cause a denial of service (condorstartd exit) via a crafted job.