Ssh20cisco125 Vulnerability May 2026

There is no official vulnerability record or CVE known as "ssh20cisco125." This identifier appears to be a specific string used in vulnerability scanner results (such as Qualys, Tenable/Nessus, or Rapid7) to flag that a Cisco device is running SSH version 1.25 or is susceptible to a specific SSH protocol-level flaw.

Official References

Affected Hardware includes (but is not limited to): ssh20cisco125 vulnerability

The ssh-20-cisco-125 vulnerability refers to a critical security weakness in the Secure Shell (SSH) protocol implementation on certain Cisco devices. This vulnerability has significant implications for network administrators and cybersecurity professionals, as it can allow unauthorized access to sensitive network devices. In this paper, we will examine the nature of the ssh-20-cisco-125 vulnerability, its impact on Cisco devices, and provide recommendations for mitigation and remediation. There is no official vulnerability record or CVE

  1. Restrict access to the device: Limit access to the device to only trusted IP addresses and networks.
  2. Implement rate limiting: Implement rate limiting on the device to prevent an attacker from sending a large number of malicious SSH packets.

Article last updated: May 2026

Then use a tool like ssh-audit:

2. Check for Compromise

Simply patching is not enough for this vulnerability. The backdoor persists on the filesystem. You must check for indicators of compromise (IoCs). Affected Hardware includes (but is not limited to):

Here is a blog post detailing the vulnerability landscape surrounding this issue.