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CTX335432 {{tooltipText}}

Citrix Hypervisor Security Update

Applicable Products

  • Citrix Hypervisor

Description of Problem

Several security issues have been identified in Citrix Hypervisor, that may each allow privileged code in a guest VM to cause the host to crash or become unresponsive. 

These issues have the following identifiers: 

  • CVE-2021-28704 
  • CVE-2021-28705 
  • CVE-2021-28714 
  • CVE-2021-28715 

All of these issues affect all currently supported versions of Citrix Hypervisor.


What Customers Should Do

Citrix has released hotfixes to address these issues. Citrix recommends that affected customers install these hotfixes as their patching schedule allows.  The hotfixes can be downloaded from the following locations: 

Citrix Hypervisor 8.2 CU1 LTSR: CTX338448 – https://support.citrix.com/article/CTX338448 and CTX335882 – https://support.citrix.com/article/CTX335882

Citrix Hypervisor 8.2: CTX338444 – https://support.citrix.com/article/CTX338444 and CTX335880 – https://support.citrix.com/article/CTX335880

Citrix XenServer 7.1 LTSR CU2: CTX335531 – https://support.citrix.com/article/CTX335531 and CTX335881 – https://support.citrix.com/article/CTX335881


What Citrix is Doing

Citrix is notifying customers and channel partners about this potential security issue through the publication of this security bulletin on the Citrix Knowledge Center at https://support.citrix.com/securitybulletins.

Obtaining Support on This Issue

If you require technical assistance with this issue, please contact Citrix Technical Support. Contact details for Citrix Technical Support are available at https://www.citrix.com/support/open-a-support-case.

Subscribe to Receive Alerts

Citrix strongly recommends that all customers subscribe to receive alerts when a Citrix security bulletin is created or modified at https://support.citrix.com/user/alerts.

Reporting Security Vulnerabilities to Citrix

Citrix welcomes input regarding the security of its products and considers any and all potential vulnerabilities seriously. For details on our vulnerability response process and guidance on how to report security-related issues to Citrix, please see the following webpage: https://www.citrix.com/about/trust-center/vulnerability-process.html.

Disclaimer

This document is provided on an "as is" basis and does not imply any kind of guarantee or warranty, including the warranties of merchantability or fitness for a particular use. Your use of the information on the document is at your own risk. Citrix reserves the right to change or update this document at any time. Customers are therefore recommended to always view the latest version of this document directly from the Citrix Knowledge Center.

Changelog

Date Change
2022-01-12 Initial Publication