Ssh-2.0-cisco-1.25 Vulnerability Jun 2026

If you have identified devices reporting ssh-2.0-cisco-1.25 , follow this prioritized action plan.

This specific banner is common on older Cisco IOS and IOS-XE releases. By itself, the string is not a flaw; it is an identifier. However, security scanners flag it because this specific version version is known to contain unpatched security vulnerabilities. Associated Risks and Vulnerabilities

(Not ideal – SSHv1 is insecure.)

Recent reports have identified a critical vulnerability (CVSS 10.0) in certain Cisco products using the Erlang/OTP SSH implementation. It allows unauthenticated remote code execution by sending connection protocol messages before authentication occurs.

This article will dissect exactly what SSH-2.0-Cisco-1.25 means, explore the real vulnerabilities tied to this SSH implementation, distinguish between myth and fact, and provide a definitive guide to remediation. ssh-2.0-cisco-1.25 vulnerability

Disclaimer: The information in this article is based on publicly available Cisco Security Advisories and security research reports from 2023-2025.

Many of these devices are exposed directly to the public internet. If you have identified devices reporting ssh-2

: Continued use of CBC-mode ciphers (e.g., aes128-cbc ), which are susceptible to side-channel attacks. How to Secure Your Cisco Device

: An unauthenticated, remote attacker can send specially crafted connection protocol messages over the network to bypass security restrictions entirely. This allows for arbitrary code execution directly within the system shell, leading to a complete compromise of the underlying infrastructure, data manipulation, and lateral movement. The Terrapin Attack (CVE-2023-48795) However, security scanners flag it because this specific

Look for: