Redis before 6cbea7d allows a replica to cause an assertion failure in a primary server by sending a non-administrative command (specifically, a SET command). NOTE: this was fixed for Redis 6.2.x and 7.x in 2021. Versions before 6.2 were not intended to have safety guarantees related to this.
https://security.netapp.com/advisory/ntap-20230814-0007/
https://github.com/redis/redis/issues/8712
https://github.com/redis/redis/commit/6cbea7d29b5285692843bc1c351abba1a7ef326f
https://github.com/redis/redis/commit/46f4ebbe842620f0976a36741a72482620aa4b48