CVE-2025-2486

UEFI Shell accessible in AAVMF with Secure Boot enabled on Ubuntu

Published Nov 26, 2025 CVSS 4.0 · 3.7 Low EPSS < 1% KEV · Not listed
Description
The Ubuntu edk2 UEFI firmware packages accidentally allowed the UEFI Shell to be accessed in Secure Boot environments, possibly allowing bypass of Secure Boot constraints. Versions 2024.05-2ubuntu0.3 and 2024.02-2ubuntu0.3 disable the Shell. Some previous versions inserted a secure-boot-based decision to continue running inside the Shell itself, which is believed to be sufficient to enforce Secure Boot restrictions. This is an additional repair on top of the incomplete fix for CVE-2023-48733.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Tianocore
Tianocore edk2
CPEs cpe:2.3:a:tianocore:edk2:202402*:*:*:*:*:*:*:*
cpe:2.3:a:tianocore:edk2:202405:*:*:*:*:*:*:*
Vendors & Products Tianocore
Tianocore edk2
Metrics cvssV3_1

{'score': 3.6, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N'}

cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H'}

Type Values Removed Values Added
References
Metrics threat_severity

None

cvssV3_1

{'score': 3.6, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N'}

threat_severity

Low

Type Values Removed Values Added
First Time appeared Canonical
Canonical ubuntu
Ubuntu
Ubuntu edk2
Ubuntu ubuntu
Vendors & Products Canonical
Canonical ubuntu
Ubuntu
Ubuntu edk2
Ubuntu ubuntu
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description The Ubuntu edk2 UEFI firmware packages accidentally allowed the UEFI Shell to be accessed in Secure Boot environments, possibly allowing bypass of Secure Boot constraints. Versions 2024.05-2ubuntu0.3 and 2024.02-2ubuntu0.3 disable the Shell. Some previous versions inserted a secure-boot-based decision to continue running inside the Shell itself, which is believed to be sufficient to enforce Secure Boot restrictions. This is an additional repair on top of the incomplete fix for CVE-2023-48733.
Title UEFI Shell accessible in AAVMF with Secure Boot enabled on Ubuntu
Weaknesses CWE-489
References
Metrics cvssV4_0

{'score': 3.7, 'vector': 'CVSS:4.0/AV:L/AC:H/AT:N/PR:N/UI:A/VC:N/VI:H/VA:N/SC:H/SI:H/SA:H/E:U'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
canonical
Published
Updated
Nov 26, 2025, 6:25 PM
Reserved
Mar 18, 2025, 1:16 AM
Status
Analyzed
Published
Nov 26, 2025, 6:15 PM
Modified
Oct 18, 2026, 8:10 PM
Severity
Low
Public date
Nov 26, 2025, 5:33 PM