The "ssh20cisco125" vulnerability, also formally identified as CVE-2023-20186 , is a specific security flaw affecting the SSH implementation in various Cisco devices. Vulnerability Name: SSH20Cisco125 CVE Identifier: CVE-2023-20186
The flaw exists in the handling of SSH protocol messages during the authentication phase. By sending specially crafted connection protocol messages before authentication occurs , an attacker can bypass security controls and achieve complete system compromise. The vulnerability affects any system running an SSH server based on the Erlang/OTP SSH library, including multiple Cisco products such as ConfD, ConfD Basic (CSCwo83759), and Network Services Orchestrator (CSCwo83796).
The flaw exists due to insufficient restrictions on access to internal services. An attacker with a valid user account can use crafted syntax when connecting to the Cisco IMC through SSH to modify system configurations and escalate privileges. ssh20cisco125 vulnerability exclusive
Keys belonging to former employees or legacy automation scripts often remain authorized inside device configurations indefinitely.
: Security teams should look for unusual SSH login patterns, specifically connections from unknown IP addresses that use public-key authentication without prior successful pairings. The vulnerability affects any system running an SSH
The architectural threat profile of an SSH v2.0 flaw within a Cisco environment centers around how an active daemon processes incoming configuration strings and cryptographic handshakes.
The server's state machine fails to correctly represent internal states when processing these specific traffic patterns, leading to memory corruption or unexpected execution flow. A successful exploit allows the attacker to: Execute Arbitrary Code: Keys belonging to former employees or legacy automation
Public keys are designed to be shared. However, in this vulnerability, knowledge of the public key was sufficient (along with a username) to bypass authentication. This means that in high‑security environments, at least until all affected devices are patched.
To ensure that strings such as ssh20cisco125 cannot be leveraged as an active exploit vector against your routing and switching fabric, execute the following technical remediation steps within the Cisco Command Line Interface (CLI): Step 1: Terminate Insecure Protocol Versions
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