Dashboard / CVE-2026-20293

CVE-2026-20293

HIGH
MEDIUM Priority: 0.01 BB Relevance: 39/100
Published: 2026-09-08 Modified: 2026-10-26 First seen: 2026-10-29 Status: active

Attack Surface

Low Complexity No Interaction Conf. Impact Integ. Impact

CVSS Vector Breakdown

AV: Local
AC: Low
PR: Low
UI: None
S: Unchanged
C: High
I: High
A: None

Description

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.

Weakness Classification (1)

Affected Software (351)

VendorProductVersion
cisco enterprise_nfv_infrastructure_software 3.3.1
cisco enterprise_nfv_infrastructure_software 3.4.1
cisco enterprise_nfv_infrastructure_software 3.5.1
cisco enterprise_nfv_infrastructure_software 3.5.2
cisco enterprise_nfv_infrastructure_software 3.6.1
cisco enterprise_nfv_infrastructure_software 3.6.2
cisco enterprise_nfv_infrastructure_software 3.6.3
cisco enterprise_nfv_infrastructure_software 3.7.1
cisco enterprise_nfv_infrastructure_software 3.8.1
cisco enterprise_nfv_infrastructure_software 3.9.1
cisco enterprise_nfv_infrastructure_software 3.9.2
cisco enterprise_nfv_infrastructure_software 3.10.1
cisco enterprise_nfv_infrastructure_software 3.10.2
cisco enterprise_nfv_infrastructure_software 3.10.3
cisco enterprise_nfv_infrastructure_software 3.11.1
cisco enterprise_nfv_infrastructure_software 3.11.2
cisco enterprise_nfv_infrastructure_software 3.11.3
cisco enterprise_nfv_infrastructure_software 3.12.1
cisco enterprise_nfv_infrastructure_software 3.12.1a
cisco enterprise_nfv_infrastructure_software 3.12.1b
cisco enterprise_nfv_infrastructure_software 3.12.2
cisco enterprise_nfv_infrastructure_software 3.12.3
cisco enterprise_nfv_infrastructure_software 4.1.1
cisco enterprise_nfv_infrastructure_software 4.1.2
cisco enterprise_nfv_infrastructure_software 4.2.1
cisco enterprise_nfv_infrastructure_software 4.2.2
cisco enterprise_nfv_infrastructure_software 4.4.1
cisco enterprise_nfv_infrastructure_software 4.4.2
cisco enterprise_nfv_infrastructure_software 4.4.3
cisco enterprise_nfv_infrastructure_software 4.5.1
Showing 30 of 351 entries

References & Advisories (1)

Bug Bounty Relevance

39 / 100
✓ Low complexity
✓ No user interaction

CVSS Score

7.1 / 10.0 v3.1
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

EPSS — Exploitation Probability

0.18%
Raw Score 0.001810
Percentile 7.6%
Date 2026-10-29

EPSS Trend

2026-10-29
0.00181
2026-10-28
0.00181

Intelligence Sources

nvd ref →

External Links