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https://www.heise.de/news/Citrix-Hypervisor-und-XenServer-Ausbrueche-aus-virtuellen-Maschinen-moeglich-4996405.html
https://support.citrix.com/article/CTX286756
Whats about XCP-NG ?
thx Axel
@axel See the December 2020 Security Updates for XCP-ng and update
See also https://xcp-ng.org/docs/security.html
And https://xcp-ng.org/blog/tag/security/