What is CVE-2021-34708?

CVE-2021-34708 is a vulnerability that affects Cisco Network Convergence System (NCS) 540 Series Routers and Cisco 8000 Series Routers.

How severe is CVE-2021-34708?

CVE-2021-34708 has a severity rating of 6.7, which is classified as high.

What is the affected software for CVE-2021-34708?

The affected software for CVE-2021-34708 includes Cisco IOS XR NCS540L software images and Cisco IOS XR Software for Cisco 8000 Series Routers.

How can an attacker exploit CVE-2021-34708?

An authenticated, local attacker can exploit CVE-2021-34708 to execute arbitrary code.

Is there a fix available for CVE-2021-34708?

Yes, Cisco has released software updates to address CVE-2021-34708. It is recommended to update to the latest version.

Vulnerability/
CVE-2021-34708

high

7.2

CWE

347

9/9/2021

21/9/2021

CVE-2021-34708

First published: Thu Sep 09 2021(Updated: )

Multiple vulnerabilities in image verification checks of Cisco Network Convergence System (NCS) 540 Series Routers, only when running Cisco IOS XR NCS540L software images, and Cisco IOS XR Software for Cisco 8000 Series Routers could allow an authenticated, local attacker to execute arbitrary code on the underlying operating system. For more information about these vulnerabilities, see the Details section of this advisory.

Credit: ykramarz@cisco.com

Affected Software	Affected Version	How to fix
Cisco IOS XR	<7.3.2
Cisco 8101-32fh
Cisco 8101-32h
Cisco 8102-64h
Cisco 8201
Cisco 8201-32fh
Cisco 8202
Cisco 8800 12-slot
Cisco 8800 18-slot
Cisco 8800 4-slot
Cisco 8800 8-slot
Cisco IOS XR	>=7.4.0<7.4.1
Cisco N540-12z20g-sys-a
Cisco N540-12z20g-sys-d
Cisco N540-24z8q2c-m
Cisco N540-24z8q2c-sys
Cisco N540-28z4c-sys-a
Cisco N540-28z4c-sys-d
Cisco N540-acc-sys
Cisco N540x-12z16g-sys-a
Cisco N540x-12z16g-sys-d
Cisco N540x-16z4g8q2c-a
Cisco N540x-16z4g8q2c-d
Cisco N540x-acc-sys

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Reference Links

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-lnt-QN9mCzwn

Frequently Asked Questions

What is CVE-2021-34708?
CVE-2021-34708 is a vulnerability that affects Cisco Network Convergence System (NCS) 540 Series Routers and Cisco 8000 Series Routers.
How severe is CVE-2021-34708?
CVE-2021-34708 has a severity rating of 6.7, which is classified as high.
What is the affected software for CVE-2021-34708?
The affected software for CVE-2021-34708 includes Cisco IOS XR NCS540L software images and Cisco IOS XR Software for Cisco 8000 Series Routers.
How can an attacker exploit CVE-2021-34708?
An authenticated, local attacker can exploit CVE-2021-34708 to execute arbitrary code.
Is there a fix available for CVE-2021-34708?
Yes, Cisco has released software updates to address CVE-2021-34708. It is recommended to update to the latest version.

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