CVE-2021-1620

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.

Risk Information

Base Score

7.7

MODERATE

Vector

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

EPSS Score

Exploitation Probability

0.33

Associated Vulnerability

Vulnerability	OS Platform
Cisco IOS and IOS XE Software IKEv2 AutoReconnect Feature Denial of Service Vulnerability For Cisco IOS	NCM
Cisco IOS and IOS XE Software IKEv2 AutoReconnect Feature Denial of Service Vulnerability For Cisco IOS XE Software	NCM
Missing Release of Resource after Effective Lifetime Vulnerability (CVE-2021-1620)	NCM

Patch Details

Click to see the patches provided by ManageEngine for this CVE

Patch ID	Patch Description
PATCH-1706090	Security Update for Cisco IOS Amsterdam-17.2.1r
PATCH-1706107	Security Update for Cisco IOS XE Software 5.2(1)SV5(1.3a)

References

https://nvd.nist.gov/vuln/detail/CVE-2023-1234
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-1234