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Cisco Bug: CSCun75294 - Cisco IOS XR SSH Login Vulnerability

Last Modified

Jan 30, 2020

Products (1)

  • Cisco Carrier Routing System

Known Affected Releases


Description (partial)

A vulnerability in OpenSSH module of the Cisco IOS XR Software could allow an "authenticated", 
remote attacker to cause the SSH login process to reset unexpectedly.

The vulnerability is due to improperly input validation of the channel identifier with the SSH 
handshake negotiation . An attacker could exploit this vulnerability by initiating a SSH session with 
the device and sending a crafted SSH packet in the negotiation with an invalid channel identified. 
An exploit could allow the attacker to reset the SSH login process causing a partial denial of service 
(DoS) condition.

Device running with SSH in the configuration running an affected version of software.
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Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
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  • Known Fixed Releases
  • Related Community Discussions
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