Details for this vulnerability have not been published by NIST at this point. Descriptions from software vendor advisories for this issue are provided below.
From VID-A8D94711-0D03-11EA-87CA-001999F8D30B:
The Asterisk project reports:
A SIP request can be sent to Asterisk that can change
a SIP peers IP address. A REGISTER does not need to occur,
and calls can be hijacked as a result. The only thing
that needs to be known is the peers name; authentication
details such as passwords do not need to be known. This
vulnerability is only exploitable when the nat option is
set to the default, or auto_force_rport.
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