Security scanners (like Nessus or Qualys) often flag this banner because it reveals the device's operating system and version, which can help an attacker identify known vulnerabilities. Below is a breakdown of what this banner means and the actual vulnerabilities often associated with it. What is SSH-2.0-Cisco-1.25?
If a network scan reveals devices reporting this version string, immediate action is required. ssh-2.0-cisco-1.25 vulnerability
For a penetration tester, seeing ssh-2.0-cisco-1.25 is akin to finding an unlocked window on the ground floor. Security scanners (like Nessus or Qualys) often flag
ssh -v user@<cisco-device-ip> 2>&1 | grep "SSH-2.0-Cisco" If a network scan reveals devices reporting this
—identifying the exact operating system and software version to find matching exploits. Several critical vulnerabilities have affected Cisco devices running versions associated with this banner over the years: NetCom Learning SSH Terrapin Prefix Truncation Weakness - Cisco Community