An issue was discovered in SaltStack Salt before 3002.5. Sending crafted web requests to the Salt API can result in salt.utils.thin.gen_thin() command injection because of different handling of single versus double quotes. This is related to salt/utils/thin.py.
https://github.com/saltstack/salt/releases
https://lists.debian.org/debian-lts-announce/2021/11/msg00009.html
https://security.gentoo.org/glsa/202103-01