Cisco UCS and UCS-Based Appliances UEFI Shell Secure Boot Bypass Vulnerability
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 or an unauthenticated attacker with physical access to an affected device to bypass UEFI Secure Boot validation checks and execute unauthorized software. 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 UE
Read at Cisco PSIRT Security Advisories
- Vendor
- Cisco
- Product
- GRUB / Secure Boot
- EPSS
- 0.002 (p8)
- Exposure class
- Operating system
Why it ranks 25 (Notable)
- Product class: operating system
- Widely deployed vendor product (Cisco)
- Covered by 2 independent sources
- Vendor security advisory
- Recency: items published within 24 hours gain 15, within 72 hours 6, within 7 days 2.
Links
- Cisco PSIRT Security Advisories (sec.cloudapps.cisco.com)
- CVE-2026-20293 on this site · NVD · CVE.org · Vulnpedia
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