Cisco IOS XR Software for ASR 9000 Series Slow Path Forwarding DoS (cisco-sa-xr-cp-dos-ej8VB9QY)

High Nessus Plugin ID 142890

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VPR Score: 5.2


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


According to its self-reported version, IOS-XR is affected by a denial of service (DoS) vulnerability in the ingress packet processing function due to improper resource allocation when processing network traffic in software switching mode (punted). An unauthenticated, remote attacker can exploit this, by sending specific streams of Layer 2 or Layer 3 protocol data units (PDUs) to an affected device, in order to cause a DoS condition on the device.

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


Upgrade to the relevant fixed version referenced in Cisco bug ID CSCvv09115

See Also

Plugin Details

Severity: High

ID: 142890

File Name: cisco-sa-xr-cp-dos-ej8VB9QY-iosxr.nasl

Version: 1.7

Type: local

Family: CISCO

Published: 2020/11/13

Updated: 2020/12/01

Dependencies: 71430, 133723

Risk Information

Risk Factor: High

VPR Score: 5.2

CVSS Score Source: CVE-2020-26070

CVSS v2.0

Base Score: 7.8

Temporal Score: 5.8

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

Temporal Vector: CVSS2#E:U/RL:OF/RC:C

CVSS v3.0

Base Score: 8.6

Temporal Score: 7.5

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

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

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: 2020/11/10

Vulnerability Publication Date: 2020/11/10

Reference Information

CVE: CVE-2020-26070


CISCO-SA: cisco-sa-xr-cp-dos-ej8VB9QY

IAVA: 2020-A-0526