Ssh-2.0-cisco-1.25 Vulnerability Jun 2026

Many legacy Cisco-1.25 banners indicate the device relies on cryptographic handshakes vulnerable to .

While "security by obscurity" isn't a primary defense, you can prevent casual scanning from identifying your exact version. On some platforms, you can customize or suppress parts of the SSH banner via the banner command, though the protocol-level version string (Cisco-1.25) is often hard-coded into the stack. Summary Table Vulnerability Mitigation Security Downgrade Disable ChaCha20-Poly1305 and CBC ciphers. RCE (CVE-2025-32433) Full System Takeover Immediate software update/patching. Weak KEX/Ciphers Data Decryption Update ip ssh settings to use SHA-2 and CTR.

This persistent history demonstrates that the SSH-2.0-Cisco-1.25 banner is not just an identifier; it is a flag indicating a long legacy of management plane vulnerabilities that require constant vigilance. ssh-2.0-cisco-1.25 vulnerability

A prominent and severe threat tied directly to certain Cisco products running SSH environments is .

When an SSH client connects to a Cisco device, the server returns a banner identifying the SSH protocol version and the server software. SSH-2.0-Cisco-1.25 typically indicates that the device is running a specific version of the Cisco IOS SSH server implementation, which is often tied to older software releases. Many legacy Cisco-1

The string is the standard software banner embedded within the proprietary Secure Shell (SSH) server engine of older or unpatched Cisco IOS, IOS XE, and CatOS network infrastructure appliances. When network scanners or automated malicious scripts connect to an open Port 22, this string exposes the specific operating system signature.

You can check the local SSH status directly from the Cisco command-line interface (CLI): Router# show ssh Use code with caution. This persistent history demonstrates that the SSH-2

The appearance of this string in security reports usually indicates the device is running a version of Cisco software that has not yet been hardened against recent SSH exploits. There are two primary security concerns currently associated with this banner: 1. The Terrapin Attack (CVE-2023-48795)