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How to modify RSA SSH Hostkey to 2048 bits on Brocade Switch

Last Updated:

Applies to

  • Brocade Switch
  • FOS 7.4.2x and above


  • Security scanner application detects the vulnerability "SSH Server Public Key Too Small" against Brocade FOS.
  • RSA keys shorter than 2048 bits are considered vulnerable. Brocade recommends to install a RSA public key length of 2048 bits.
  • sshutil showhostkey command shows that RSA bit is less than 2048 bits:

switch01:FID128:root> sshutil showhostkey

1024 44:c3:88:04:31:ca:40:95:12:75:c7:d9:24:fe:6d:23 (RSA)
256 8c:64:64:30:77:ed:75:33:72:b1:37:e3:07:97:26:8b (ECDSA)
1024 c0:74:9a:14:78:6e:4d:a6:0b:35:e3:f1:df:41:0d:86 (DSA)


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