Disabling SSLv2 on the system that supports it is sufficient to prevent the DROWN attack.
If you are hosted by Blackbaud:
SSLv2 is disabled on all hosted servers. We have disabled this protocol where it was present in our environment and continue our standard processes of reviewing our configurations for all exceptions or deviations to our preferred configurations.
If your organization hosts Blackbaud NetCommunity and/or The Raiser's Edge Web Services Server (or REWS):
System administrators should work directly with their security team and internal resources to address the DROWN vulnerability and to disable SSLv2 on the Blackbaud NetCommunity web server and/or REWS.