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      <title>CVE-2026-20293 — Cisco UCS and UCS-Based Appliances UEFI Shell Secure Boot Bypass Vulnerability</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2026-20293</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Cisco Enterprise NFV Infrastructure Software, Cisco Unified Computing System (Managed), Cisco Unified Computing System (Standalone), Cisco Unified Computing System E-Series Software (UCSE)&lt;/p&gt;
&lt;p&gt;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&amp;amp;nbsp;or an unauthenticated attacker with physical access to an affected device to bypass UEFI Secure Boot validation checks and execute unauthorized software.&#13;
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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.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Cisco Enterprise NFV Infrastructure Software, Cisco Unified Computing System (Managed), Cisco Unified Computing System (Standalone), Cisco Unified Computing System E-Series Software (UCSE)&lt;/p&gt;
&lt;p&gt;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&amp;amp;nbsp;or an unauthenticated attacker with physical access to an affected device to bypass UEFI Secure Boot validation checks and execute unauthorized software.&#13;
&#13;
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.&lt;/p&gt;</content:encoded>
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