Cisco has confirmed that newer IOS-XR and Meraki products are not impacted by this specific historical flaw. Critical Mitigation and Solutions
Devices running Cisco IOS 12.4-based releases.
A successful exploit causes the device to experience a "spurious memory access error" and reload. Repeated exploitation can keep the network infrastructure offline indefinitely. Affected Cisco Systems ssh20cisco125 vulnerability exclusive
While modern Cisco NX-OS and IOS XE have faced their own SSH-related vulnerabilities—such as CVE-2023-20050 and CVE-2022-20920—the era vulnerability is distinct because of its legacy nature.
Use CoPP to drop unauthorized SSH packets before they reach the device's route processor. Cisco has confirmed that newer IOS-XR and Meraki
The most effective remediation is to apply the relevant patch provided by Cisco Support .
The vulnerability lies within the server-side SSH implementation. It allows an attacker to send crafted packets during the SSH session establishment phase. The most effective remediation is to apply the
Remote and unauthenticated. An attacker does not need valid credentials to crash the device.