Cisco IOS XR OpenSSH Module SSH Login Channel Identifier DoS

medium Nessus Plugin ID 91192


The remote device is missing a vendor-supplied security patch.


The version of Cisco IOS XR software running on the remote device is affected by a denial of service vulnerability in the OpenSSH module due to improper validation of the channel identifier during an SSH handshake negotiation. An authenticated, remote attacker can exploit this issue, via a crafted SSH packet with an invalid channel identifier, to reset the SSH login process.


Upgrade to the relevant fixed version referenced in Cisco bug ID CSCun75294.

See Also

Plugin Details

Severity: Medium

ID: 91192

File Name: cisco-CSCun75294-iosxr.nasl

Version: 1.4

Type: combined

Family: CISCO

Published: 5/17/2016

Updated: 4/8/2021

Supported Sensors: Nessus

Risk Information


Risk Factor: Medium

Base Score: 4

Temporal Score: 3

Vector: CVSS2#AV:N/AC:L/Au:S/C:N/I:N/A:P

CVSS Score Source: CVE-2015-4193

Vulnerability Information

CPE: cpe:/o:cisco:ios_xr

Required KB Items: Host/Cisco/IOS-XR/Version

Exploit Ease: No known exploits are available

Patch Publication Date: 8/11/2015

Vulnerability Publication Date: 8/11/2015

Reference Information

CVE: CVE-2015-4193