The SSH server is configured to support Cipher Block Chaining (CBC) encryption. This may allow an attacker to recover the plaintext message from the ciphertext. (Source: Tenable Nessus)
As this issue is assessed as low severity, users may evaluate their environments and decide if updating is required.
This alert has come from: https://www.moxa.com/en/support/product-support/security-advisory/mpsa-257312-security-enhancement-ssh-server-cbc-mode-ciphers-enabled