Ssh-2.0-cisco-1.25 Vulnerability May 2026

The SSH-2.0-Cisco-1.25 vulnerability is a security flaw that affects certain versions of Cisco's Secure Shell (SSH) implementation. SSH is a widely used protocol for secure remote access to network devices, and Cisco's implementation is used in many of their products. In this article, we'll delve into the details of the vulnerability, its impact, and provide guidance on how to mitigate it.

SSH-2.0-Cisco-1.25 is a specific version of the SSH protocol implementation developed by Cisco. It is used to establish secure connections between a client and a server, allowing administrators to remotely access and manage network devices. The "2.0" in the version string refers to the SSH protocol version 2, which is a widely used and considered secure version of the protocol. ssh-2.0-cisco-1.25 vulnerability

The vulnerability is caused by a buffer overflow condition in the Cisco SSH implementation. When a client attempts to authenticate using keyboard-interactive authentication, the server does not properly validate the length of the authentication request. This allows an attacker to send a specially crafted request that overflows the buffer, potentially allowing the attacker to execute arbitrary code on the server. The SSH-2