Cisco’s Product Security Incident Response Team (PSIRT) noted attempted exploitation of this vulnerability in the wild as of June 2025. Exposure and Attack Surface
ssh -oKexAlgorithms=diffie-hellman-group1-sha1 -c 3des-cbc user@target
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The vulnerability affects devices configured for RSA-based user authentication (public key).
Most security scanners (Nessus, Qualys, OpenVAS) flag SSH-2.0-Cisco-1.25 as – not critical alone, but a strong indicator the device is outdated. ssh-2.0-cisco-1.25 vulnerability
: Leverage Nessus, OpenVAS, or similar scanners. Plugins like 165676 can actively test for known Cisco vulnerabilities by attempting to authenticate and send specific SSH requests to identify vulnerable versions.
The "ssh-2.0-cisco-1.25 vulnerability" is not a single bug but rather a . It tells a story: a Cisco device deployed years ago, likely stable, and forgotten by security teams. While the banner itself does not guarantee compromise, it dramatically increases the attack surface. : Leverage Nessus, OpenVAS, or similar scanners
Legacy operational technology (OT) environments fear downtime more than security. A router that controls a pipeline cannot be rebooted for a patch without a maintenance window that may not exist for months.
: Allows a remote, unauthenticated attacker to execute arbitrary commands with administrative privileges. It tells a story: a Cisco device deployed