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The string is an operational version banner broadcasted by thousands of enterprise network devices worldwide. It explicitly indicates that the targeted enterprise asset is a Cisco Systems hardware device running an internal, built-in Secure Shell (SSH) version 2 server environment.
Crafting an SSH inbound request using an invalid or specifically malformed reverse-login username causes an unhandled memory exception inside the Cisco internal SSH state machine. The operating system crashes and forces a cold reboot. 3. Weak Cryptographic Cipher Suites
In 2025, Cisco announced CVE-2025-20159, a critical vulnerability affecting the management interface ACL processing in Cisco IOS XR Software. This vulnerability allows an unauthenticated, remote attacker to completely bypass configured access control lists (ACLs) for SSH, NetConf, and gRPC features. This is a severe failure because management ACLs are intended to be the last line of defense, restricting which IP addresses can reach the device's management plane. A bypass renders these access rules completely ineffective. ssh-2.0-cisco-1.25 vulnerability
The string is not a specific flaw itself, but rather the standardized software banner broadcasted by the Cisco IOS SSH server to establish cryptographic handshakes. Because this exact string maps to hundreds of thousands of active Enterprise routing and switching environments, threat actors look for this specific banner to identify target networks for a range of Cisco IOS and IOS XE SSH protocol flaws.
Consult Cisco Security Advisories for the latest recommended software releases that patch the SSH RSA-based authentication bypass vulnerability. The string is an operational version banner broadcasted
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This limits exposure but doesn’t fix the flaw. The operating system crashes and forces a cold reboot
Update your Cisco IOS/NX-OS to the latest version. You can check your status on the Cisco Bug Search Tool using your specific device model.
To mitigate the SSH-2.0-Cisco-1.25 vulnerability:
PORT STATE SERVICE VERSION 22/tcp open ssh SSH-2.0-Cisco-1.25 | ssh-hostkey: | 1024 8a:fd:ec:e5:11:22:33:44:55:66:77:88:99:aa:bb:cc (DSA) | 2048 ab:cd:ef:12:34:56:78:90:12:34:56:78:90:12:34:56 (RSA) |_ 256 fe:dc:ba:98:76:54:32:10:ab:cd:ef:gh:ij:kl:mn:op (ECDSA) | ssh2-algos: | kex_algorithms: (1) | diffie-hellman-group1-sha1 <-- VULNERABLE (Logjam) | server_host_key_algorithms: (2) | ssh-rsa | ssh-dss <-- VULNERABLE (1024-bit DSA is weak) | encryption_algorithms: (4) | aes128-cbc <-- WEAK (CBC Mode) | 3des-cbc <-- WEAK (Sweet32) | aes192-cbc | aes256-cbc