I also hit this connecting to Cisco, log from cisco:

SSH2 0:  Invalid modulus length

For me

ssh -o KexAlgorithms=diffie-hellman-group14-sha1 x.x.x.x

works fine.

It affects not all Cisco, mainly old ones are not affected.

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https://bugs.launchpad.net/bugs/1287222

Title:
  openssh-client 6.5 regression bug with certain servers

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