CVE-2025-2486

Secure Boot bypass via exposed UEFI Shell

Published Nov 26, 2025 · Updated Nov 26, 2025

Secure Boot bypass in Ubuntu EDK II allows local users to access the AAVMF UEFI Shell in affected aarch64 virtual machines. The Ubuntu AAVMF firmware image includes and launches the built-in UEFI Shell while Secure Boot is enabled instead of disabling that component. Reachability requires active local interaction with a Secure Boot-enabled aarch64 virtual machine; shell access can bypass boot restrictions and alter protected state.

CVSS severityUnavailable
Unscored
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Secure Boot bypass in Ubuntu EDK II allows local users to access the AAVMF UEFI Shell in affected aarch64 virtual machines. The Ubuntu AAVMF firmware image includes and launches the built-in UEFI Shell while Secure Boot is enabled instead of disabling that component. Reachability requires active local interaction with a Secure Boot-enabled aarch64 virtual machine; shell access can bypass boot restrictions and alter protected state.

The record

CVE
CVE-2025-2486
Published
Nov 26, 2025
Updated
Nov 26, 2025
Vendor
TianoCore
Product
EDK II
Classifications
CWE-489
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 26, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 26, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2024.02 <2024.02-2ubuntu0.3
  2. Affected versionversion=2024.05 <2024.05-2ubuntu0.3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

TianoCore · EDK IIversion=2024.02 <2024.02-2ubuntu0.3; version=2024.05 <2024.05-2ubuntu0.3

Published CVSS scores

3.7Canonical Ltd.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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-489Active Debug Code

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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