CVE-2023-49721
LXD UEFI Shell Bypass Vulnerability
Description
An insecure default to allow UEFI Shell in EDK2 was left enabled in LXD. 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]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] |
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-2023-49721.
| 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://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://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-2023-49721 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-2023-49721
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-2023-49721 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2023-49721 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:tianocore:edk2:*:-:*:*:*:*:*:* versions up to (including) 2023.11-8 *cpe:2.3:a:canonical:lxd:*:*:*:*:*:*:*:* versions from (including) 5.0.0 up to (excluding) 5.21.0 Added Reference Type CVE: https://bugs.launchpad.net/ubuntu/+source/edk2/+bug/2040137 Types: Issue Tracking Added Reference Type Canonical Ltd.: 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 Canonical Ltd.: https://bugs.launchpad.net/ubuntu/+source/lxd/+bug/2040139 Types: Issue Tracking Added Reference Type CVE: https://nvd.nist.gov/vuln/detail/CVE-2023-48733 Types: Third Party Advisory Added Reference Type Canonical Ltd.: https://nvd.nist.gov/vuln/detail/CVE-2023-48733 Types: Third Party Advisory Added Reference Type CVE: https://www.openwall.com/lists/oss-security/2024/02/14/4 Types: Mailing List Added Reference Type Canonical Ltd.: https://www.openwall.com/lists/oss-security/2024/02/14/4 Types: Mailing List -
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://nvd.nist.gov/vuln/detail/CVE-2023-48733 Added Reference https://www.openwall.com/lists/oss-security/2024/02/14/4 -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Oct. 24, 2024
Action Type Old Value New Value Added CWE CISA-ADP CWE-276 -
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 LXD. This allows an OS-resident attacker to bypass Secure Boot. Added Reference Canonical Ltd. https://bugs.launchpad.net/ubuntu/+source/lxd/+bug/2040139 [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/edk2/+bug/2040137 [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
Vulnerability Scoring Details
Base CVSS Score: 6.7
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.02 }} 0.00%
score
0.02919
percentile