Ssh-2.0-cisco-1.25 Vulnerability _hot_ -

On supported devices, the SSH configuration should be hardened to disable all weak and deprecated cryptographic primitives. This includes explicitly disabling key exchange algorithms like diffie-hellman-group1-sha1 , which are commonly required for compatibility with older devices. Administrators should also disable older protocol versions and weaker cipher suites where possible.

Here’s a breakdown of what’s commonly referred to in security research as the fingerprint, including its background, associated vulnerabilities, and how to investigate it properly.

Banner 1.25 typically maps to:

Use Access Control Lists (ACLs) to limit SSH access to known, trusted management IP addresses.

: The flaw exists in the initial message negotiation phase before a user ever submits a password or cryptographic key. ssh-2.0-cisco-1.25 vulnerability

October 26, 2023 Target Service: SSH-2.0-Cisco-1.25 Severity: High to Critical (Context Dependent)

The widespread presence of this banner is not accidental. Its format follows the SSH standard, which requires the server to announce its software and version information upon connection. This practice aids debugging and protocol compatibility negotiations. However, from a security perspective, it also unintentionally provides attackers with valuable fingerprinting data. On supported devices, the SSH configuration should be

Beyond the SSHredder class, Cisco's SSH stack has a history of vulnerabilities that primarily lead to DoS conditions, causing device reloads.

Another vulnerability (often tracked alongside Cisco SSH issues) allows an authenticated attacker to cause an affected device to reload unexpectedly. Here’s a breakdown of what’s commonly referred to