What is CVE-2021-34728?

CVE-2021-34728 is a vulnerability in the CLI of Cisco IOS XR Software that could allow an authenticated, local attacker to elevate privileges on an affected device.

What is the severity of CVE-2021-34728?

The severity of CVE-2021-34728 is high with a CVSS score of 7.8.

How can an attacker exploit CVE-2021-34728?

An attacker with a low-privileged account can exploit CVE-2021-34728 by leveraging vulnerabilities in the CLI of Cisco IOS XR Software to elevate privileges on the targeted device.

Which versions of Cisco IOS XR Software are affected by CVE-2021-34728?

Cisco IOS XR Software versions up to and including 7.3.2 and versions 7.4.0 to 7.4.1 are affected by CVE-2021-34728.

How can I mitigate the CVE-2021-34728 vulnerability?

To mitigate the CVE-2021-34728 vulnerability, Cisco recommends upgrading to a fixed software release.

Vulnerability/
CVE-2021-34728

high

7.8

CWE

9/9/2021

7/11/2024

CVE-2021-34728: Cisco IOS XR Software Authenticated User Privilege Escalation Vulnerabilities

First published: Thu Sep 09 2021(Updated: )

Multiple vulnerabilities in the CLI of Cisco IOS XR Software could allow an authenticated, local attacker with a low-privileged account to elevate privileges on an affected device. 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 IOS XR	>=7.4.0<7.4.1
Cisco Asr 9000v-v2
Cisco Asr 9001
Cisco Asr 9006
Cisco Asr 9010
Cisco Asr 9901
Cisco Asr 9902
Cisco Asr 9903
Cisco Asr 9904
Cisco Asr 9906
Cisco Asr 9910
Cisco Asr 9912
Cisco Asr 9922
Cisco Ios Xrv
Cisco Ios Xrv 9000
Cisco Ncs 520
Cisco Ncs 540
Cisco Ncs 540 Fronthaul
Cisco Ncs 560-4
Cisco Ncs 560-7
Cisco Ncs 5001
Cisco Ncs 5002
Cisco Ncs 5011
Cisco Ncs 4009
Cisco Ncs 4016
Cisco Ncs 5501
Cisco Ncs 5501-se
Cisco Ncs 5502
Cisco Ncs 5502-se
Cisco Ncs 5508
Cisco Ncs 5516
Cisco Ncs 6000
Cisco Ncs 6008
Cisco Ncs 1001
Cisco Ncs 1002
Cisco Ncs 1004
Cisco 8101-32fh
Cisco 8101-32h
Cisco 8102-64h
Cisco 8201
Cisco 8201-32fh
Cisco 8202
Cisco 8804
Cisco 8808
Cisco 8812
Cisco 8818

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Reference Links

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-privescal-dZYMrKf

Frequently Asked Questions

What is CVE-2021-34728?
CVE-2021-34728 is a vulnerability in the CLI of Cisco IOS XR Software that could allow an authenticated, local attacker to elevate privileges on an affected device.
What is the severity of CVE-2021-34728?
The severity of CVE-2021-34728 is high with a CVSS score of 7.8.
How can an attacker exploit CVE-2021-34728?
An attacker with a low-privileged account can exploit CVE-2021-34728 by leveraging vulnerabilities in the CLI of Cisco IOS XR Software to elevate privileges on the targeted device.
Which versions of Cisco IOS XR Software are affected by CVE-2021-34728?
Cisco IOS XR Software versions up to and including 7.3.2 and versions 7.4.0 to 7.4.1 are affected by CVE-2021-34728.
How can I mitigate the CVE-2021-34728 vulnerability?
To mitigate the CVE-2021-34728 vulnerability, Cisco recommends upgrading to a fixed software release.