The string "SSH-2.0-Cisco-1.25" is a software version identifier (banner) frequently used by Cisco networking devices to identify their SSH implementation. While this specific banner is not a vulnerability itself, it is often associated with older Cisco IOS software that contains a known Denial of Service (DoS) vulnerability, specifically tracked as CVE-2022-20864.

By default there are only two privilege levels in use on a Cisco device, level 1 and level 15. Level 1 is essentially Exec access, Cisco Learning Network

Fortunately, several steps can be taken to protect against the exploitation of SSH vulnerabilities:

If left unaddressed, the SSH20CISCO125 vulnerability poses several risks:

Access Control Lists (ACLs): Restrict SSH access (Port 22) only to known, trusted management IP addresses. This prevents external actors from fingerprinting your internal SSH version.

Authentication Bypass: While difficult to execute, some researchers suggest that the memory state could be manipulated to bypass the standard credential check under very specific timing conditions. How to Identify if You’re Vulnerable

Not Vulnerable

  • Cisco IOS-XR (uses different SSH stack).
  • Cisco Meraki (cloud-managed, distinct codebase).
  • Any device with ip ssh version 1 forced (rare, insecure).

Details: The SSH service lacks effective flood protection, allowing an unauthenticated remote attacker to make the SSH port unresponsive through a DoS attack. How to Verify Your Device

access-list 99 permit host 192.168.1.100
line vty 0 4
 access-class 99 in

Ssh20cisco125 Vulnerability Exclusive [extra Quality]

The string "SSH-2.0-Cisco-1.25" is a software version identifier (banner) frequently used by Cisco networking devices to identify their SSH implementation. While this specific banner is not a vulnerability itself, it is often associated with older Cisco IOS software that contains a known Denial of Service (DoS) vulnerability, specifically tracked as CVE-2022-20864.

By default there are only two privilege levels in use on a Cisco device, level 1 and level 15. Level 1 is essentially Exec access, Cisco Learning Network ssh20cisco125 vulnerability exclusive

Fortunately, several steps can be taken to protect against the exploitation of SSH vulnerabilities: The string "SSH-2

If left unaddressed, the SSH20CISCO125 vulnerability poses several risks: Cisco IOS-XR (uses different SSH stack)

Access Control Lists (ACLs): Restrict SSH access (Port 22) only to known, trusted management IP addresses. This prevents external actors from fingerprinting your internal SSH version.

Authentication Bypass: While difficult to execute, some researchers suggest that the memory state could be manipulated to bypass the standard credential check under very specific timing conditions. How to Identify if You’re Vulnerable

Not Vulnerable

  • Cisco IOS-XR (uses different SSH stack).
  • Cisco Meraki (cloud-managed, distinct codebase).
  • Any device with ip ssh version 1 forced (rare, insecure).

Details: The SSH service lacks effective flood protection, allowing an unauthenticated remote attacker to make the SSH port unresponsive through a DoS attack. How to Verify Your Device

access-list 99 permit host 192.168.1.100
line vty 0 4
 access-class 99 in