CVE-2021-29951

The Mozilla Maintenance Service granted SERVICE_START access to
BUILTIN|Users which, in a domain network, grants normal remote users access
to start or stop the service. This could be used to prevent the browser
update service from operating (if an attacker spammed the ‘Stop’ command);
but also exposed attack surface in the maintenance service. Note: This
issue only affected Windows operating systems older than Win 10 build 1709.
Other operating systems are unaffected.. This vulnerability affects
Thunderbird < 78.10.1, Firefox < 87, and Firefox ESR < 78.10.1.

Notes