{"id":657,"date":"2020-05-14T22:45:38","date_gmt":"2020-05-14T14:45:38","guid":{"rendered":"https:\/\/www.insecurewire.com\/?p=657"},"modified":"2020-05-14T22:45:38","modified_gmt":"2020-05-14T14:45:38","slug":"removing-esx-problem-hyperthreading-unmitigated-message","status":"publish","type":"post","link":"https:\/\/www.insecurewi.re\/index.php\/2020\/05\/14\/removing-esx-problem-hyperthreading-unmitigated-message\/","title":{"rendered":"Removing &#8220;esx.problem.hyperthreading.unmitigated&#8221; Message"},"content":{"rendered":"<p>This message appears if your ESXi > 6.x host has hyperthreading enabled and is vulnerable to the L1TF CVE&#8217;s. Recently I had to rebuild an ESXi 6.0 on a host and got this message after the inital boot when connecting to VCenter:<br \/>\n<a href=\"https:\/\/www.insecurewire.com\/wp-content\/uploads\/2020\/06\/ht.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.insecurewi.re\/wp-content\/themes\/breek\/assets\/images\/transparent.gif\" data-lazy=\"true\" data-src=\"https:\/\/www.insecurewire.com\/wp-content\/uploads\/2020\/06\/ht.png\" alt=\"HT\" width=\"470\" height=\"108\" class=\"aligncenter size-full wp-image-783\" data-srcset=\"https:\/\/www.insecurewi.re\/wp-content\/uploads\/2020\/06\/ht.png 470w, https:\/\/www.insecurewi.re\/wp-content\/uploads\/2020\/06\/ht-300x69.png 300w, https:\/\/www.insecurewi.re\/wp-content\/uploads\/2020\/06\/ht-100x23.png 100w\" data-sizes=\"auto, (max-width: 470px) 100vw, 470px\" \/><\/a><\/p>\n<p>The message can be surpressed if for example the host has to stay on a specific version of ESXi and you are happy with the security risk of having Hyper Threading enabled. Here is how:<br \/>\n1. Launch the Center Console<br \/>\n2. Browse to Host > Configuration > Advanced Settings.<br \/>\n3. Scroll down to UserVars and click on it.<br \/>\n4. Scroll down to UserVars.SuppressHyperThreadingWarning and enter 1 in the box. The click ok. The warning message will now be surpressed. Note all this does is supress the warning, nothing more.<\/p>\n<p><a href=\"https:\/\/www.insecurewire.com\/wp-content\/uploads\/2020\/05\/uservar.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.insecurewi.re\/wp-content\/themes\/breek\/assets\/images\/transparent.gif\" data-lazy=\"true\" data-src=\"https:\/\/www.insecurewire.com\/wp-content\/uploads\/2020\/05\/uservar.png\" alt=\"UserVars\" width=\"728\" height=\"613\" class=\"aligncenter size-full wp-image-659\" data-srcset=\"https:\/\/www.insecurewi.re\/wp-content\/uploads\/2020\/05\/uservar.png 728w, https:\/\/www.insecurewi.re\/wp-content\/uploads\/2020\/05\/uservar-300x253.png 300w, https:\/\/www.insecurewi.re\/wp-content\/uploads\/2020\/05\/uservar-100x84.png 100w, https:\/\/www.insecurewi.re\/wp-content\/uploads\/2020\/05\/uservar-534x450.png 534w\" data-sizes=\"auto, (max-width: 728px) 100vw, 728px\" \/><\/a><\/p>\n<p>More info can be found at this <a href=\"https:\/\/kb.vmware.com\/s\/article\/57374\" rel=\"noopener noreferrer\" target=\"_blank\">VMware KB<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>This message appears if your ESXi > 6.x host has hyperthreading enabled and is vulnerable to the L1TF CVE&#8217;s. Recently I had to rebuild an&#8230;<\/p>\n","protected":false},"author":2,"featured_media":783,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[17],"tags":[97,198],"class_list":["post-657","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-vmware","tag-esxi","tag-vmware"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Removing &quot;esx.problem.hyperthreading.unmitigated&quot; Message - Insecure Wire<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.insecurewi.re\/index.php\/2020\/05\/14\/removing-esx-problem-hyperthreading-unmitigated-message\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Removing &quot;esx.problem.hyperthreading.unmitigated&quot; Message - Insecure Wire\" \/>\n<meta property=\"og:description\" content=\"This message appears if your ESXi &gt; 6.x host has hyperthreading enabled and is vulnerable to the L1TF CVE&#8217;s. 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