Ssh-2.0-cisco-1.25 Vulnerability Better Info

An attacker sending a single crafted SSHv2 packet can crash the device. No logs may be left before crash.

If the output shows:

SSH-2.0-Cisco-2.22 (IOS 15.9) SSH-2.0-Cisco-2.36 (IOS-XE 16.x)

Attackers establish standard SSH tunnels and blast specific, non-standard traffic patterns to mismatch internal variables. ssh-2.0-cisco-1.25 vulnerability

The Erlang/OTP SSH Remote Code Execution Flaw (CVE-2025-32433)

First, let's break down the identifier.

Understanding and Mitigating the "SSH-2.0-Cisco-1.25" Vulnerability An attacker sending a single crafted SSHv2 packet

1. The Core Vulnerabilities Associated with SSH-2.0-Cisco-1.25

The string SSH-2.0-Cisco-1.25 SSH server banner typically seen when connecting to Cisco IOS or IOS-XE devices. This banner itself is a version string, not a specific vulnerability, but its presence indicates the device is running a version of the Cisco SSH implementation that may be susceptible to several known protocol-level and implementation-specific vulnerabilities. Devolutions Forum Key Vulnerabilities Associated with Cisco SSH

: A logical flaw in the subsystem's processing of RSA-based public key validation. This banner itself is a version string, not

Because this version is dated, it is frequently flagged by scanners because it supports weak cryptographic algorithms or is susceptible to protocol-level attacks discovered in recent years. Top Vulnerabilities Linked to This Version

The most critical contemporary vulnerability associated with Cisco SSH services is the (CVE-2023-48795), which affects various Cisco platforms including Catalyst switches and XR routers. Key Vulnerabilities for Cisco SSH

Older Cisco SSH stacks often default to algorithms now considered "broken" or "weak":

: The attack forces a downgrade of the connection's security profile , turning off extensions like ChaCha20-Poly1305 or Encrypt-then-MAC, leaving the active session exposed to data decryption or session hijacking. Cryptographic Degradation (Diffie-Hellman Group 1 & MD5)