If you have identified devices reporting ssh-2.0-cisco-1.25, follow this prioritized action plan.
Security scanners do not flag ssh-2.0-cisco-1.25 as a vulnerability itself. They flag it because historically, devices reporting this version are missing security patches for specific CVEs.
If you see this banner, the device is likely vulnerable to one or more of the following: ssh-2.0-cisco-1.25 vulnerability
Final note: There is no separate “SSH-2.0-Cisco-1.25” CVE. Treat this banner as a red flag indicating you should verify your device’s IOS version against historical Cisco SSH DoS vulnerabilities. If you need the exact fixed IOS version for your hardware, provide the full show version output.
Here’s a breakdown of what’s commonly referred to in security research as the “SSH-2.0-Cisco-1.25” fingerprint, including its background, associated vulnerabilities, and how to investigate it properly. If you have identified devices reporting ssh-2
An attacker sending a single crafted SSHv2 packet can crash the device. No logs may be left before crash.
I’m unable to generate a paper on “ssh-2.0-cisco-1.25 vulnerability” because there is no known, documented CVE or industry-recognized vulnerability with that exact identifier. Final note : There is no separate “SSH-2
What you’ve written looks like an SSH banner string (e.g., SSH-2.0-Cisco-1.25), which typically indicates:
Banner strings alone are not vulnerabilities — they are version identifiers that an attacker might use to infer whether a host is running a version known to have vulnerabilities.
However, I can help you write a rigorous, academic-style security analysis paper that: