What is the vulnerability ID for this vulnerability?

The vulnerability ID for this vulnerability is CVE-2021-1243.

What is the severity level of CVE-2021-1243?

The severity level of CVE-2021-1243 is high with a score of 7.5.

Which software versions are affected by CVE-2021-1243?

Cisco IOS XR Software versions between 6.1.1 and 6.6.4, 7.0.0 and 7.0.2, 6.7.1, 7.0.11, 7.1.0, and 7.2.0 are affected by CVE-2021-1243.

What is the description of CVE-2021-1243?

CVE-2021-1243 is a vulnerability in the SNMP with the management plane protection feature of Cisco IOS XR Software that could allow an unauthenticated, remote attacker to bypass management plane protection.

How can I fix CVE-2021-1243?

To fix CVE-2021-1243, it is recommended to apply the necessary updates as mentioned in the Cisco Security Advisory.

Vulnerability/
CVE-2021-1243

high

7.5

CWE

284

4/2/2021

8/11/2024

CVE-2021-1243: Cisco IOS XR Software SNMP Management Plane Protection ACL Bypass Vulnerability

First published: Thu Feb 04 2021(Updated: )

A vulnerability in the Local Packet Transport Services (LPTS) programming of the SNMP with the management plane protection feature of Cisco IOS XR Software could allow an unauthenticated, remote attacker to allow connections despite the management plane protection that is configured to deny access to the SNMP server of an affected device. This vulnerability is due to incorrect LPTS programming when using SNMP with management plane protection. An attacker could exploit this vulnerability by connecting to an affected device using SNMP. A successful exploit could allow the attacker to connect to the device on the configured SNMP ports. Valid credentials are required to execute any of the SNMP requests.

Credit: ykramarz@cisco.com

Affected Software	Affected Version	How to fix
Cisco IOS XR	>6.1.1<6.6.4
Cisco IOS XR	>=7.0.0<7.0.2
Cisco IOS XR	=6.7.1
Cisco IOS XR	=7.0.11
Cisco IOS XR	=7.1.0
Cisco IOS XR	=7.2.0

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Reference Links

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snmp-7MKrW7Nq

Frequently Asked Questions

What is the vulnerability ID for this vulnerability?
The vulnerability ID for this vulnerability is CVE-2021-1243.
What is the severity level of CVE-2021-1243?
The severity level of CVE-2021-1243 is high with a score of 7.5.
Which software versions are affected by CVE-2021-1243?
Cisco IOS XR Software versions between 6.1.1 and 6.6.4, 7.0.0 and 7.0.2, 6.7.1, 7.0.11, 7.1.0, and 7.2.0 are affected by CVE-2021-1243.
What is the description of CVE-2021-1243?
CVE-2021-1243 is a vulnerability in the SNMP with the management plane protection feature of Cisco IOS XR Software that could allow an unauthenticated, remote attacker to bypass management plane protection.
How can I fix CVE-2021-1243?
To fix CVE-2021-1243, it is recommended to apply the necessary updates as mentioned in the Cisco Security Advisory.

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