: Cisco-1.25 alone does not confirm any specific CVE. It must be cross-referenced with show version output.
Providing the hardware type can help narrow down the exact patch you need.
If encryption is weakened, attackers might be able to hijack administrative sessions.
Understanding the "SSH-2.0-Cisco-1.25" Banner and Modern Security Risks ssh-2.0-cisco-1.25 vulnerability
Ensure the device is configured to only allow SSH version 2 and that the server-side RSA keys are properly managed. 6. Conclusion
The theoretical risks associated with this banner have transitioned into real-world, high-stakes attacks. In 2025, cybersecurity agencies, including CISA in the United States, issued emergency directives regarding critical zero-day vulnerabilities in Cisco ASA and Secure Firewall appliances. These vulnerabilities, tracked as CVE-2025-20333 and CVE-2025-20362, were leveraged by advanced threat actors to implant malware on vulnerable devices.
The identification of Cisco-1.25 suggests the device is utilizing an older SSH implementation library. Below are the primary vulnerabilities associated with this specific banner. : Cisco-1
SSH-2.0-Cisco-1.25 — a banner string that shows up when an SSH client probes a Cisco device — reads like a tiny mechanical signature, but it’s also an entry point into wider questions about security, disclosure, and how small protocol details can have outsized effects.
The SSH-2.0-Cisco-1.25 vulnerability affects certain versions of Cisco's SSH implementation, including:
: A Man-in-the-Middle (MitM) attacker intercepts the handshake negotiation between the client and the Cisco SSH server. If encryption is weakened, attackers might be able
By delivering a corrupted or specific malformed sequence during public-key authentication, an attacker can trick the protocol parser into granting an administrative command-line interface (CLI) session without requiring valid secret keys. 2. Reverse SSH Username DoS (CVE-2012-0388)
: A flaw in validation mechanics lets a remote actor bypass standard cryptographic check boundaries.