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6.7
MEDIUM CVSS 3.1
CVE-2023-48733
Ubuntu EDK2 UEFI Shell Default Enabled Vulnerability
Description

An insecure default to allow UEFI Shell in EDK2 was left enabled in Ubuntu's EDK2. This allows an OS-resident attacker to bypass Secure Boot.

INFO

Published Date :

Feb. 14, 2024, 10:15 p.m.

Last Modified :

Aug. 26, 2025, 5:19 p.m.

Remotely Exploit :

No

Source :

[email protected]
Affected Products

The following products are affected by CVE-2023-48733 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Debian debian_linux
1 Tianocore edk2
1 Canonical lxd
: Total Affected Vendor : 3 | Products : 3
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 3.1 MEDIUM [email protected]
Solution
A vulnerability exists in the EDK2 UEFI Shell, allowing an attacker to bypass Secure Boot.
  • Update the affected packages.
  • Reboot the system.
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2023-48733.

URL Resource
https://bugs.launchpad.net/ubuntu/+source/edk2/+bug/2040137 Issue Tracking
https://bugs.launchpad.net/ubuntu/+source/lxd/+bug/2040139 Issue Tracking
https://lists.debian.org/debian-lts-announce/2024/06/msg00028.html Mailing List
https://nvd.nist.gov/vuln/detail/CVE-2023-48733 Third Party Advisory
https://www.openwall.com/lists/oss-security/2024/02/14/4 Mailing List
https://bugs.launchpad.net/ubuntu/+source/edk2/+bug/2040137 Issue Tracking
https://bugs.launchpad.net/ubuntu/+source/lxd/+bug/2040139 Issue Tracking
https://lists.debian.org/debian-lts-announce/2024/06/msg00028.html Mailing List
https://nvd.nist.gov/vuln/detail/CVE-2023-48733 Third Party Advisory
https://www.openwall.com/lists/oss-security/2024/02/14/4 Mailing List
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2023-48733 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2023-48733 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2023-48733 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2023-48733 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • Initial Analysis by [email protected]

    Aug. 26, 2025

    Action Type Old Value New Value
    Added CPE Configuration OR *cpe:2.3:a:canonical:lxd:5.0:candidate:*:*:*:*:*:* *cpe:2.3:a:canonical:lxd:5.21:candidate:*:*:*:*:*:* *cpe:2.3:a:canonical:lxd:5.21:edge:*:*:*:*:*:* *cpe:2.3:a:tianocore:edk2:*:-:*:*:*:*:*:* versions up to (including) 2023.11-8
    Added CPE Configuration OR *cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
    Added Reference Type Canonical Ltd.: https://bugs.launchpad.net/ubuntu/+source/edk2/+bug/2040137 Types: Issue Tracking
    Added Reference Type Canonical Ltd.: https://bugs.launchpad.net/ubuntu/+source/lxd/+bug/2040139 Types: Issue Tracking
    Added Reference Type Canonical Ltd.: https://lists.debian.org/debian-lts-announce/2024/06/msg00028.html Types: Mailing List
    Added Reference Type Canonical Ltd.: https://nvd.nist.gov/vuln/detail/CVE-2023-48733 Types: Third Party Advisory
    Added Reference Type Canonical Ltd.: https://www.openwall.com/lists/oss-security/2024/02/14/4 Types: Mailing List
    Added Reference Type CVE: https://bugs.launchpad.net/ubuntu/+source/edk2/+bug/2040137 Types: Issue Tracking
    Added Reference Type CVE: https://bugs.launchpad.net/ubuntu/+source/lxd/+bug/2040139 Types: Issue Tracking
    Added Reference Type CVE: https://www.openwall.com/lists/oss-security/2024/02/14/4 Types: Mailing List
    Added Reference Type CVE: https://nvd.nist.gov/vuln/detail/CVE-2023-48733 Types: Third Party Advisory
    Added Reference Type CVE: https://lists.debian.org/debian-lts-announce/2024/06/msg00028.html Types: Mailing List
  • CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

    May. 08, 2025

    Action Type Old Value New Value
    Added CWE CWE-1188
  • CVE Modified by af854a3a-2127-422b-91ae-364da2661108

    Nov. 21, 2024

    Action Type Old Value New Value
    Added Reference https://bugs.launchpad.net/ubuntu/+source/edk2/+bug/2040137
    Added Reference https://bugs.launchpad.net/ubuntu/+source/lxd/+bug/2040139
    Added Reference https://lists.debian.org/debian-lts-announce/2024/06/msg00028.html
    Added Reference https://nvd.nist.gov/vuln/detail/CVE-2023-48733
    Added Reference https://www.openwall.com/lists/oss-security/2024/02/14/4
  • CVE Modified by [email protected]

    Jun. 30, 2024

    Action Type Old Value New Value
    Added Reference Canonical Ltd. https://lists.debian.org/debian-lts-announce/2024/06/msg00028.html [No types assigned]
  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • CVE Received by [email protected]

    Feb. 14, 2024

    Action Type Old Value New Value
    Added Description An insecure default to allow UEFI Shell in EDK2 was left enabled in Ubuntu's EDK2. This allows an OS-resident attacker to bypass Secure Boot.
    Added Reference Canonical Ltd. https://bugs.launchpad.net/ubuntu/+source/edk2/+bug/2040137 [No types assigned]
    Added Reference Canonical Ltd. https://nvd.nist.gov/vuln/detail/CVE-2023-48733 [No types assigned]
    Added Reference Canonical Ltd. https://www.openwall.com/lists/oss-security/2024/02/14/4 [No types assigned]
    Added Reference Canonical Ltd. https://bugs.launchpad.net/ubuntu/+source/lxd/+bug/2040139 [No types assigned]
    Added CVSS V3.1 Canonical Ltd. AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
Vulnerability Scoring Details
Base CVSS Score: 6.7
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact
Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.01 }} 0.00%

score

0.01418

percentile