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-1B15A554-C981-11ED-BB39-901B0E9408DC:
Tailscale team reports:
A vulnerability identified in the implementation of Tailscale SSH in FreeBSD
allowed commands to be run with a higher privilege group ID than that specified
by Tailscale SSH access rules.
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