Cisco IOS XR Software for ASR 9000 Series Routers DoS (cisco-sa-npspin-QYpwdhFD)

high Nessus Plugin ID 156947


The remote device is missing a vendor-supplied security patch


According to its self-reported version, Cisco IOS XR is affected by denial of service vulnerability due to incorrect handling of specific Ethernet frames that cause a spin loop that can make the network processors unresponsive. An unauthenticated, adjacent attacker can exploit these by sending specific types of Ethernet frames on the segment where the affected line cards are attached. A successful exploit could allow the attacker to cause the affected line card to reboot.

Please see the included Cisco BIDs and Cisco Security Advisory for more information.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.


Upgrade to the relevant fixed version referenced in Cisco bug ID CSCvq33187

See Also

Plugin Details

Severity: High

ID: 156947

File Name: cisco-sa-npspin-QYpwdhFD-iosxr.nasl

Version: 1.6

Type: combined

Family: CISCO

Published: 1/21/2022

Updated: 4/22/2022

Risk Information

CVSS Score Source: CVE-2021-34713


Risk Factor: Medium

Score: 4.4


Risk Factor: Medium

Base Score: 6.1

Temporal Score: 4.5

Vector: AV:A/AC:L/Au:N/C:N/I:N/A:C

Temporal Vector: E:U/RL:OF/RC:C


Risk Factor: High

Base Score: 7.4

Temporal Score: 6.4

Vector: CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Temporal Vector: E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:cisco:ios_xr

Required KB Items: Host/Cisco/IOS-XR/Version, Host/Cisco/IOS-XR/Model, Host/Cisco/Config/show_platform

Exploit Ease: No known exploits are available

Patch Publication Date: 9/8/2021

Vulnerability Publication Date: 9/8/2021

Reference Information

CVE: CVE-2021-34713


CISCO-SA: cisco-sa-npspin-QYpwdhFD

IAVA: 2021-A-0407-S

CWE: 399