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Cisco Bug: CSCul63127 - Cisco IOS XR SSH Disconnect Error Vulnerability

Last Modified

Sep 03, 2020

Products (1)

  • Cisco ASR 9000 Series Aggregation Services Routers

Known Affected Releases


Description (partial)

A vulnerability in Cisco IOS XR Software could allow an "authenticated", remote attacker to cause a denial of service (DoS) condition.

The vulnerability is due to an error that could occur in the affected software when an SSH connection is disconnected from an affected device. An authenticated, remote attacker could exploit the vulnerability to cause the vty to become unreachable and cause further SSH or Telnet connections to the device to fail, resulting in a DoS condition.

Device running with default configuration running an affected version of software with 
frequent access via SSH to the Cisco IOS XR router.
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Bug Details Include

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