Over globally were recently detected online with this specific banner. Main Vulnerabilities Terrapin Attack (Downgrade) and Pre-Auth RCE . Mitigation
The SSH banner string SSH-2.0-Cisco-1.25 indicates that the target device is running Cisco's legacy SSH implementation, typically found on older Cisco IOS, IOS-XE, or PIX/ASA software versions. This specific version string is widely associated with Cisco devices operating on older, potentially unsupported software trains.
If you see this banner, the device is likely vulnerable to one or more of the following:
The presence of ssh-2.0-cisco-1.25 is rarely a false positive for trouble. It correlates with several major security weaknesses: ssh-2.0-cisco-1.25 vulnerability
If successful, the attacker can log in with the privileges of that user (often administrative). B. Denial of Service (DoS) - Unexpected Reload
The is a prefix truncation weakness in the SSH protocol. It allows a Man-in-the-Middle (MitM) attacker to delete messages during the initial handshake without the client or server noticing. SSH Terrapin Prefix Truncation Weakness - Cisco Community
The SSH-2.0-Cisco-1.25 string is frequently flagged by scanners such as Nessus or Shodan not necessarily because it has one single, catastrophic exploit, but because it is associated with several security weaknesses: Over globally were recently detected online with this
Are you able to , or do you need a configuration-based workaround ? Knowing this will help us determine the best path forward. Share public link
The most famous vulnerability associated with this version string is the Cisco "Small SSH" issue. Early implementations of SSH on Cisco IOS had a flaw in the key exchange mechanism. In certain configurations, an attacker could bypass authentication entirely. If a device reports this version string, it is highly likely susceptible to authentication bypass, allowing an attacker to gain administrative access without a password.
Understanding the "SSH-2.0-Cisco-1.25" Banner and Modern Security Risks This specific version string is widely associated with
: An attacker continuously floods port 22 with unusual or malformed SSH requests.
Internal flaws inside the Cisco-1.25 software state machine expose core enterprise routing switches to memory corruption and unexpected crashes.
Understanding and Mitigating the "SSH-2.0-Cisco-1.25" Vulnerability: A Comprehensive Guide
The SSH-2.0-Cisco-1.25 vulnerability is a serious security issue that requires immediate attention. By understanding the vulnerability and taking steps to mitigate it, organizations can protect their Cisco devices and prevent potential security breaches.