Ssh20cisco125 Vulnerability Exclusive: Critical RCE Threat to Cisco Infrastructure
As of today, Cisco PSIRT has not published a CVE. However, three unrelated penetration testing firms have reported anomalous SSH memory corruption when connecting from a client advertising a malformed SSH_MSG_KEXINIT packet with a crafted cookie field. The unofficial tag “SSH20CISCO125” is being used to correlate these incident reports.
Restrict SSH access (Port 22) only to known, trusted management IP addresses. This prevents external actors from fingerprinting your internal SSH version . ssh20cisco125 vulnerability exclusive
A disgruntled employee with knowledge of a valid username and its public key (which may be stored in configuration files or publicly accessible documentation) could craft an exploit to bypass the private‑key requirement and gain unauthorized access.
banner = s.recv(1024) print(f"Banner: banner") Restrict SSH access (Port 22) only to known,
Security Observation (Unconfirmed CVE) Affected Software: Unknown – requires verification Indicator: SSH banner containing ssh20cisco125 Potential Impact: Unknown – possibly a backdoor, test credential, or fingerprint for targeted access
--- - name: Patch SSH-2-Cisco-1.25 vulnerability hosts: cisco_devices become: yes banner = s
The vulnerability (often tracked under identifiers like Cisco-SA-ASA-SSH-KeyBypass) centers on a failure in how the SSH server validates user input during the authentication handshake.
. It affects the Secure Shell (SSH) implementation in certain Cisco products, potentially allowing authenticated remote attackers to cause a device reload, resulting in a Denial of Service (DoS) Vulnerability Summary Vulnerability Name: ssh20cisco125 (CVE-2022-20864) Threat Type: Denial of Service (DoS) Attack Vector: Remote, Authenticated
Cisco’s TALOS team has reportedly purchased one license to reverse-engineer the PoC. Meanwhile, the has observed scanning for port 22 coupled with malformed KEXINIT packets—likely pre-exploitation fingerprinting.
: The unexpected traffic forces an unhandled error condition within the connection, causing the underlying Cisco device to reload abruptly. This triggers a complete Denial of Service (DoS) across the network segment. 2. Strict Access Boundaries