Description of Problem
Two security issues have been identified in Citrix Hypervisor 8.2 LTSR, each of which may allow privileged code in a guest VM to cause the host to crash or become unresponsive. These issues only affect Citrix Hypervisor 8.2 LTSR.
These issues have the following CVE identifiers:
These issues have the following CVE identifiers:
- CVE-2021-3416
- CVE-2021-20257
| CVE ID | Description | Pre-conditions |
| CVE-2021-3416 | privileged code in a guest VM may cause the host to crash or become unresponsive | must be able to execute privileged code in the guest VM |
| CVE-2021-20257 | privileged code in a guest VM may cause the host to crash or become unresponsive | must be able to execute privileged code in the guest VM |
What Customers Should Do
Citrix has released a hotfix to address these issues. Citrix recommends that affected customers install this hotfix as their patching schedule allows. The hotfix can be downloaded from the following locations:
Citrix Hypervisor 8.2 LTSR: CTX310674 – https://support.citrix.com/article/CTX310674
Citrix Hypervisor 8.2 LTSR: CTX310674 – https://support.citrix.com/article/CTX310674
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 |
| 2021-06-23 | Initial Publication |