access-list 10 permit 192.168.1.0 0.0.0.255 line vty 0 4 access-class 10 in transport input ssh
: Refers to the version of the cryptographic application engine code compiled into the operating system. It does not map directly to the operating system's version (such as Cisco IOS 12.4 or 15.1). 2. Associated Vulnerabilities and Flaws
In the world of network security, few things cause a spike in adrenaline quite like an unfamiliar banner appearing in your vulnerability scanner. For many system administrators and security analysts, the string is one such trigger. Scrolling through a Nessus, OpenVAS, or Qualys report, this identifier often appears under "SSH Server Version Information," flagged with a medium or high-severity warning.
Below is a practical guide to understanding, detecting, and mitigating the risk. ssh-2.0-cisco-1.25 vulnerability
: Use central AAA (e.g., RADIUS/TACACS+) for authentication, authorization, and accounting. This provides logging, granular control, and helps prevent unauthorized privilege escalation, like the CVE-2015-0721 bypass.
The string is an SSH banner broadcast by thousands of enterprise network devices worldwide, primarily running Cisco IOS and IOS XE software. This identifier explicitly states that the device is running the Secure Shell (SSH) Version 2.0 protocol using Cisco's proprietary 1.25 software implementation module .
This article is for educational and defensive purposes. Always verify vulnerabilities against Cisco’s official PSIRT (Product Security Incident Response Team) advisories before taking action. access-list 10 permit 192
: Administrators with access can enable debug ssh on a Cisco device to view the exact exchange of identification strings during connection attempts, as seen in the official Cisco documentation:
Additional compatibility problems have been noted with the libssh library and Python's paramiko module, where authentication attempts frequently fail when targeting devices presenting this banner.
Understanding and Mitigating the "SSH-2.0-Cisco-1.25" Vulnerability Associated Vulnerabilities and Flaws In the world of
First, you must know which of your devices are running the SSH-2.0-Cisco-1.25 banner or similar vulnerable implementations. Network scanners and configuration management tools can help.
This article provides a deep dive into the risks associated with devices reporting SSH-2.0-Cisco-1.25 , specifically focusing on the most relevant vulnerabilities, and outlines necessary mitigation steps. 1. What is the SSH-2.0-Cisco-1.25 Identifier?
This article provides a comprehensive overview of what this signature means, why it is considered a vulnerability, the potential risks involved, and how to mitigate it effectively as of 2026. What is SSH-2.0-Cisco-1.25?
show version | include IOS show ip ssh
Based on the format Cisco-1.25 , the device likely dates to the mid-2000s. Common SSH vulnerabilities in that era include:
