CLI SSH not working after upgrade with OpenSSH vulnerability patch Error Bad SSH2 cipher spec

After Upgrading to a firmware version with OpenSSH v9.3 patched for the recent SSH vulnerabilities 12.1-55.304+ FIPS, 13.0-92.23+, 13.1-53.4+, 13.1-37.180+ FIPS, 14.1-22.16+ SSH is not working anymore. Putty throws the error: Network error: Software caused connection abort...