Ssh-2.0-cisco-1.25 — Vulnerability

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: The device runs into an unhandled exception state and triggers a forced system reload, generating a sustained Denial of Service (DoS) window across the production environment. 3. RSA-Based Public Key Authentication Bypass

As of this writing, a query for "SSH-2.0-Cisco-1.25" on Shodan reveals approximately devices directly exposed to the public internet. The geographic distribution is alarming: ssh-2.0-cisco-1.25 vulnerability

Devices exposing the Cisco-1.25 SSH banner are subject to a range of architectural and protocol-level vulnerabilities discovered over time. Because Cisco integrates third-party subcomponents and engines (such as Erlang/OTP or OpenSSH fragments) to manage SSH logic across different hardware trains, these systems are vulnerable to several critical attack vectors: 1. Unauthenticated Remote Code Execution (CVE-2025-32433)

An attacker with standard user credentials could exploit this to gain privileged CLI access, effectively escalating their privileges. The vulnerability received a high CVSS v3 base score of 8.0 , underscoring the potential for complete system compromise. To help tailor this information to your network,

However, the prevalence of this banner is significant because it signals the potential presence of various historical and modern critical vulnerabilities, including unpatched CVE-2002-1359 , the CVE-2015-0721 AAA bypass, and recent high-severity CVEs like CVE-2024-20526 . This article will dissect the technical nature of the SSH banner, analyze the critical vulnerabilities historically and currently associated with the device families that display it, and provide comprehensive mitigation strategies.

First, let's break down the identifier.

: The device is utilizing version 1.25 of Cisco’s internal code package for handling secure shell connections.

Network scanning tools like Nmap or Shodan frequently report banners such as SSH-2.0-Cisco-1.25 . Penetration testers and security analysts may mistakenly search for a “CVE-XXXX-XXXX” matching this exact string. This paper corrects that misconception and provides a practical framework for risk assessment. The vulnerability received a high CVSS v3 base score of 8

| Attack | Likelihood | Impact | |--------|-------------|--------| | DoS (crafted packet) | Medium | Device reload | | Weak cipher forced | Low (requires MitM) | Session decryption | | RCE | Very low (unproven for 1.25) | Critical |