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.
access-list 99 permit host 192.168.1.100 line vty 0 4 access-class 99 in
Remote, Authenticated (though some variants allow unauthenticated triggers). ssh20cisco125 vulnerability exclusive
(Note the similarity in numbers) A vulnerability in Cisco RV series routers that allows remote code execution. Are you referring to a specific CTF challenge GitHub repository where you saw this name? Providing the
To successfully exploit this flaw, an attacker must: The flaw exists due to insufficient restrictions on
SSH version 1 is inherently insecure. Ensure only version 2 is enabled. Default Credentials:
[Remote Attacker] ──( Malformed SSH Packets )──> [Vulnerable Cisco Gateway] │ ┌────────────────────────────────────────────────┴────────────────────────────────┐ ▼ ▼ ▼ [Denial of Service (DoS)] [Root-Level Exploitation] [Lateral Network Movement] - SSH subsystem crashes - Unauthenticated RCE - Pivot to inner subnets - Management access lost - Backdoor deployment - Active data exfiltration 1. Unauthenticated Remote Code Execution (RCE) (Note the similarity in numbers) A vulnerability in
: With full control over a core or distribution switch, the attacker can silently alter access control lists (ACLs), capture raw network traffic, or build tunnels directly into internal servers. Risks to Corporate Environments
– Consider regenerating and redeploying public keys for all SSH‑authenticated users after patching, to invalidate any that may have been exposed.
This flaw fundamentally breaks the security model of public-key cryptography on affected devices. It allows a remote, unauthenticated attacker to log in to a device by bypassing the requirement for a private SSH key.
Organizations should demand Software Bill of Materials (SBOM) documentation from all network equipment vendors. Without SBOM visibility, identifying supply chain vulnerabilities becomes nearly impossible.