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Cisco XE: CVE-2021-1620: Cisco IOS and IOS XE Software IKEv2 AutoReconnect Feature Denial of Service Vulnerability

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Cisco XE: CVE-2021-1620: Cisco IOS and IOS XE Software IKEv2 AutoReconnect Feature Denial of Service Vulnerability

Severity
4
CVSS
(AV:N/AC:M/Au:S/C:N/I:N/A:P)
Published
09/23/2021
Created
01/19/2022
Added
01/18/2022
Modified
01/05/2024

Description

A vulnerability in the Internet Key Exchange Version 2 (IKEv2) support for the AutoReconnect feature of Cisco IOS Software and Cisco IOS XE Software could allow an authenticated, remote attacker to exhaust the free IP addresses from the assigned local pool. This vulnerability occurs because the code does not release the allocated IP address under certain failure conditions. An attacker could exploit this vulnerability by trying to connect to the device with a non-AnyConnect client. A successful exploit could allow the attacker to exhaust the IP addresses from the assigned local pool, which prevents users from logging in and leads to a denial of service (DoS) condition.

Solution(s)

  • cisco-xe-upgrade-latest

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