scp in OpenSSH through 8.3p1 allows command injection in the scp.c toremote function, as demonstrated by backtick characters in the destination argument. NOTE: the vendor reportedly has stated that they intentionally omit validation of "anomalous argument transfers" because that could "stand a great chance of breaking existing workflows."
https://medium.com/@niedhacker/creative-tryhackme-44a65eaee5d5?source=rss------hacking-5
https://www.openssh.com/security.html
https://security.netapp.com/advisory/ntap-20200731-0007/