Ssh-2.0-cisco-1.25 Vulnerability

If your security scanner flagged this banner, it is likely checking for the following vulnerabilities that commonly affect Cisco SSH implementations: SSH Terrapin Prefix Truncation Weakness - Cisco Community

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?

Organizations should implement continuous monitoring for suspicious SSH traffic. This includes detection of brute-force attempts, unusual numbers of authentication failures, unexpected cryptographic negotiations, and anomalous connection patterns from unauthorized source IP addresses. SIEM integration and network traffic analysis tools can help identify early signs of compromise. ssh-2.0-cisco-1.25 vulnerability

The age of the underlying cryptographic stack associated with the 1.25 banner creates a third category of risk. A banner from this era likely supports outdated, weaker algorithms that are no longer considered secure.

The vulnerability affects devices configured for RSA-based user authentication (public key). If your security scanner flagged this banner, it

When an SSH client initiates a connection to a terminal, both systems swap string identifiers before exchanging keys. The string breaks down into specific protocol information:

This banner serves as a highly reliable fingerprinting tool. Automated vulnerability scanners, including Nessus, actively parse these banners to determine the operating system and potential vulnerability set of a target. OS guessing tools like Exscript have hardcoded routines that directly map the banner SSH-2.0-Cisco-1.25 to the Cisco IOS operating system. The age of the underlying cryptographic stack associated

If the output shows:

: The communication relies on the modern, cryptographically secure SSH Version 2 protocol.

Operational trade-offs