CVE-2023-48733

Name: CVE-2023-48733
Creator: NVD / NIST
Published: 2024-02-14T22:15:47.32+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.7/10EPSS 0.26%

Last modified Jun 17, 2026

CVE-2023-48733 is a medium-severity vulnerability rated 6.7/10 on the CVSS scale. 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.. EPSS estimates a 0.26% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

6.7/10

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

0.26%

16.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-1188

Affected Software

Vendor	Product	Versions	Update
Canonical	Lxd	5.0	Candidate
Canonical	Lxd	5.21	Candidate
Tianocore	Edk2	<= 2023.11-8	—
Debian	Debian Linux	10.0	—

References

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

Timeline

Published: Feb 14, 2024
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2023-48733?

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.

How severe is CVE-2023-48733?

CVE-2023-48733 has a CVSS score of 6.7/10 (MEDIUM severity). The EPSS model estimates a 0.26% probability of exploitation in the next 30 days.

How do I fix CVE-2023-48733?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-48733?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST