{"id":18444,"date":"2026-09-09T04:30:46","date_gmt":"2026-09-08T20:30:46","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-20293"},"modified":"2026-09-09T04:30:46","modified_gmt":"2026-09-08T20:30:46","slug":"cve-2026-20293","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-20293","title":{"rendered":"CVE-2026-20293 [HIGH] &#8211; A vulnerability in the Unified Extensible Firmware Interface (UEFI) Shell implementation o"},"content":{"rendered":"<p>A vulnerability in the Unified Extensible Firmware Interface (UEFI) Shell implementation of Cisco UCS Servers and UCS-based appliances could allow an authenticated attacker with valid credentials for a user account with the role of user or admin&nbsp;or an unauthenticated attacker with physical access to an affected device to bypass UEFI Secure Boot validation checks and execute unauthorized software.<\/p>\n<p>This vulnerability is due to the availability of memory write commands in the UEFI Shell while UEFI Secure Boot is enabled on a device. An attacker could exploit this vulnerability by selecting the UEFI Shell boot option at boot time and using available shell commands to modify UEFI memory variables. A successful exploit could allow the attacker to manipulate the preboot environment, overwrite UEFI Secure Boot-related memory values, and execute unauthorized software on the affected device.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A vulnerability in the Unified Extensible Firmware Interface (UEFI) Shell implementation of Cisco UCS Servers and UCS-based appliances could allow an authenticated attacker with valid credentials for <\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-18444","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/18444","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln"}],"about":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/types\/vuln"}],"wp:attachment":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=18444"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=18444"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=18444"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}