CVE-2021-1243 MEDIUM

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

Vendor Cisco
Product Cisco IOS XR Software
Weakness CWE-284
Published February 4, 2021
Last update November 8, 2024

CVSS base score

5.3/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality Low
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

February 4, 2021 CVE published
November 8, 2024 Record updated