Upgrade the device firmware to a supported release and regenerate RSA keys.
Beyond direct security vulnerabilities, the SSH-2.0-Cisco-1.25 server is notorious for several implementation quirks that primarily cause operational headaches and, in some cases, could degrade the security posture of an SSH session. ssh-2.0-cisco-1.25 vulnerability
The most effective solution is upgrading your device operating system to a modern, vendor-supported release. Upgrading replaces the underlying legacy SSH code with a secure version. Always check the Cisco Software Advisor to find the stable release for your specific hardware. Step 2: Harden SSH Configuration Upgrade the device firmware to a supported release
SSH-2.0-Cisco-1.25 is an identification string (banner) sent by Cisco network devices during the SSH version exchange process. Upgrading replaces the underlying legacy SSH code with
In later, but still overlapping versions, NX-OS devices with an SSH version similar to 1.25 were vulnerable to an authenticated command injection flaw in the SSH subsystem. A user with low privileges could escalate to root.
To prevent similar vulnerabilities in the future, administrators should: