Teefer did not correctly handle double-frees in cleanup code.
This issue was resolved in SEP 14 and backported to SEP 12.1 RU6 MP8.
If you are experiencing this issue with SEP 12.1 RU6 MP7 or lower, if it is not immediately possible to upgrade to SEP 12.1 RU6 MP8 or higher, it is recommended to temporarily revert back to using the Windows Firewall. As disabling the Firewall policy would still leave the Teefer driver enabled, this can only be done by removing the Firewall feature from SEP, by e.g. deploying a new installation package without that feature.
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