high
8.6
CWE
399
Advisory Published
Updated

CVE-2022-20756: Cisco Identity Services Engine RADIUS Service Denial of Service Vulnerability

First published: Wed Apr 06 2022(Updated: )

A vulnerability in the RADIUS feature of Cisco Identity Services Engine (ISE) could allow an unauthenticated, remote attacker to cause the affected system to stop processing RADIUS packets. This vulnerability is due to improper handling of certain RADIUS requests. An attacker could exploit this vulnerability by attempting to authenticate to a network or a service where the access server is using Cisco ISE as the RADIUS server. A successful exploit could allow the attacker to cause Cisco ISE to stop processing RADIUS requests, causing authentication/authorization timeouts, which would then result in legitimate requests being denied access. Note: To recover the ability to process RADIUS packets, a manual restart of the affected Policy Service Node (PSN) is required. See the Details section for more information.

Credit: ykramarz@cisco.com

Affected SoftwareAffected VersionHow to fix
Cisco Identity Services Engine=2.2.0-patch17
Cisco Identity Services Engine=2.4.0-patch12
Cisco Identity Services Engine=2.4.0-patch13
Cisco Identity Services Engine=2.4.0-patch14
Cisco Identity Services Engine=2.6.0-patch10
Cisco Identity Services Engine=2.6.0-patch5
Cisco Identity Services Engine=2.6.0-patch6
Cisco Identity Services Engine=2.6.0-patch7
Cisco Identity Services Engine=2.6.0-patch8
Cisco Identity Services Engine=2.6.0-patch9
Cisco Identity Services Engine=2.7.0-patch2
Cisco Identity Services Engine=2.7.0-patch3
Cisco Identity Services Engine=2.7.0-patch4
Cisco Identity Services Engine=2.7.0.356-patch1
Cisco Identity Services Engine=3.0.0
Cisco Identity Services Engine=3.1

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Reference Links

Frequently Asked Questions

  • What is CVE-2022-20756?

    CVE-2022-20756 is a vulnerability found in the RADIUS feature of Cisco Identity Services Engine (ISE) that could allow an unauthenticated, remote attacker to cause the affected system to stop processing RADIUS packets.

  • How does CVE-2022-20756 occur?

    CVE-2022-20756 occurs due to improper handling of certain RADIUS requests in Cisco Identity Services Engine (ISE).

  • Who can exploit CVE-2022-20756?

    Any unauthenticated, remote attacker can exploit CVE-2022-20756.

  • What is the severity of CVE-2022-20756?

    CVE-2022-20756 has a severity level of high with a CVSS score of 7.5.

  • How can I fix CVE-2022-20756?

    To fix CVE-2022-20756, apply the necessary patches or updates provided by Cisco Identity Services Engine (ISE).

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