CVE-2020-6799

Command line arguments could have been injected during Firefox invocation
as a shell handler for certain unsupported file types. This required
Firefox to be configured as the default handler for a given file type and
for a file downloaded to be opened in a third party application that
insufficiently sanitized URL data. In that situation, clicking a link in
the third party application could have been used to retrieve and execute
files whose location was supplied through command line arguments. Note:
This issue only affects Windows operating systems and when Firefox is
configured as the default handler for non-default filetypes. Other
operating systems are unaffected. This vulnerability affects Firefox < 73
and Firefox < ESR68.5.

Notes