Mumble is vulnerable to remote code execution. The vulnerability exists when a victim navigates to a crafted URL on a server list and clicks on the Open Webpage text.
github.com/mumble-voip/mumble/commit/e59ee87abe249f345908c7d568f6879d16bfd648
github.com/mumble-voip/mumble/compare/1.3.3...1.3.4
github.com/mumble-voip/mumble/pull/4733
lists.debian.org/debian-lts-announce/2021/02/msg00022.html
security-tracker.debian.org/tracker/CVE-2021-27229
security.gentoo.org/glsa/202105-13