Vulnerability in Cisco Enterprise Nfv Infrastructure Software
CVE-2026-20293
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 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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.002 (4.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 5th percentile — 4.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
Affected products
- Cisco Enterprise Nfv Infrastructure Software — versions 3.10.1, 3.10.2, 3.10.3
- Cisco Unified Computing System E-Series Software (Ucse) — versions 4.11.1, 4.12.1, 4.12.2
- Cisco Unified Computing System (Managed) — versions 4.0(1a), 4.0(1b), 4.0(1c)
- Cisco Unified Computing System (Standalone) — versions 1.0(0.240001), 1.0(0.250003), 1.0(1.250002)
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-20293?
- CVE-2026-20293 is a high-severity vulnerability in Cisco Enterprise Nfv Infrastructure Software, classified under CWE-749. CVSS score: 7.1/10. Published 2026-09-08.
- How severe is CVE-2026-20293?
- High severity. CVSS v3 base score is 7.1 out of 10.