Ssh-2.0-cisco-1.25 Vulnerability _verified_ Official

An unpatched instance broadcasting the SSH-2.0-Cisco-1.25 profile may be vulnerable to several critical flaws in Cisco's SSH state machines and protocol engines: 1. Authentication Bypass (CVE-2015-6280)

Many legacy Cisco systems displaying the 1.25 string rely on older, default SSH negotiation ciphers. This makes them primary targets for the widespread .

When a client connects to a Cisco network device via Port 22, the device transmits its software version identification string: SSH-[Protocol Version]-[Software Version] ssh-2.0-cisco-1.25 vulnerability

This persistent history demonstrates that the SSH-2.0-Cisco-1.25 banner is not just an identifier; it is a flag indicating a long legacy of management plane vulnerabilities that require constant vigilance.

If an immediate patch is not possible, temporarily disable RSA-based authentication on the VTY lines. line vty 0 15 no ip ssh pubkey-chain Use code with caution. An unpatched instance broadcasting the SSH-2

The string SSH-2.0-Cisco-1.25 is not a specific vulnerability itself, but rather the version banner

The string is an operational version banner broadcasted by thousands of enterprise network devices worldwide. It explicitly indicates that the targeted enterprise asset is a Cisco Systems hardware device running an internal, built-in Secure Shell (SSH) version 2 server environment. When a client connects to a Cisco network

In the realm of network security, the SSH (Secure Shell) protocol is the backbone of remote administration. It is the secure lock on the door to your network infrastructure. However, a simple banner string—specifically ssh-2.0-cisco-1.25 —often serves as a flashing neon sign to attackers, indicating that the lock might be broken, outdated, or fundamentally weak.

The impact of the SSH-2.0-Cisco-1.25 vulnerability is significant. If exploited, an attacker could:

: The operating system vendor providing the code framework.

The SSHredder test suite revealed multiple critical flaws: