Ssh20cisco125 Vulnerability May 2026
The string "ssh20cisco125" refers to an SSH banner—a standard identification string sent by a Cisco device during the initial handshake of an SSH connection. It specifically denotes the protocol version ( ) and the Cisco-specific SSH implementation version ( Cisco-1.25
- Cisco 1000 Series Integrated Services Routers (ISR)
- Cisco 4000 Series ISRs
- Cisco Catalyst 8000V Edge Software
- Cisco Catalyst 8300 Series Edge Platforms
Step 1: Check RSA Key Modulus on Cisco Device
Denial of Service (DoS)
The flaw is categorized as a vulnerability. It stems from improper handling of resources during "exceptional situations" within the SSH state machine when processing specific, crafted SSH requests. Attack Vector : Remote, Authenticated. ssh20cisco125 vulnerability
SSH20Cisco125
The vulnerability is a wake-up call about the dangers of cryptographic entropy stagnation. While not a new zero-day, its reappearance in threat actor toolkits proves that old weaknesses never die – they just become 125-byte RSA keys waiting to be factored. The string "ssh20cisco125" refers to an SSH banner—a