Attackers can gain complete control of routers and switches, allowing them to redirect traffic, monitor sensitive data, and install persistent backdoors.
Device(config)# ip access-list standard SSH_ADMINS Device(config-std-nacl)# permit 10.100.50.0 0.0.0.255 Device(config-std-nacl)# exit Device(config)# line vty 0 4 Device(config-line)# access-class SSH_ADMINS in Device(config-line)# transport input ssh Use code with caution. 4. Implement Session Timeouts and Connection Limits
To patch the vulnerability, you can use a tool like Ansible to automate the process. Here's an example playbook: ssh20cisco125 vulnerability exclusive
Although ssh20cisco125 is not yet a public CVE, the evidence of active exploitation is compelling. Organizations still running Cisco IOS 15.x or early 16.x/17.x releases should treat this as a . The attack surface is enormous: over 1.2 million Cisco devices globally still accept the vulnerable KEX algorithms.
The SSH service must be enabled, and the attacker must have network access to the management interface. Attackers can gain complete control of routers and
An unauthenticated, remote attacker can log in as a specific user without the required private SSH key Requirement:
While "SSH-2.0-Cisco-1.25" itself is just a version indicator, several critical vulnerabilities affect the Cisco SSH stacks that display this or similar banners. Below is a write-up of the most prominent recent vulnerability associated with these service banners. Implement Session Timeouts and Connection Limits To patch
The vulnerability primarily impacts Cisco devices running older or unpatched versions of Cisco IOS and IOS XE.