Citrix has released security updates to address vulnerabilities (CVE-2021-28038, CVE-2021-28688, CVE-2020-35498) in Citrix Hypervisor (formerly XenServer). An attacker could exploit some of these vulnerabilities to cause a denial-of-service condition. Citrix recommends customers install these updates. More information on vulnerabilities and updates is available in the Citrix Security Bulletin – citrix.com.