What is CVE-2023-49721?

CVE-2023-49721 is a medium-severity vulnerability in Canonical Ltd. Lxd, classified under Incorrect Default Permissions. CVSS score: 6.7/10. Published 2024-02-14.

How severe is CVE-2023-49721?

Medium severity. CVSS v3 base score is 6.7 out of 10.

Vulnerability in Canonical Ltd. Lxd

CVE-2023-49721

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

Published 2024-02-14 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.7 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.002 (13.3th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 13th percentile — 13.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-276 — Incorrect Default Permissions

References

bugs.launchpad.net/ubuntu/+source/lxd/+bug/2040139 (issue-tracking, Issue Tracking)
nvd.nist.gov/vuln/detail/CVE-2023-48733 (issue-tracking, Third Party Advisory)
www.openwall.com/lists/oss-security/2024/02/14/4 (mailing-list, Mailing List)
bugs.launchpad.net/ubuntu/+source/edk2/+bug/2040137 (issue-tracking, Issue Tracking)

Frequently asked questions

What is CVE-2023-49721?: CVE-2023-49721 is a medium-severity vulnerability in Canonical Ltd. Lxd, classified under Incorrect Default Permissions. CVSS score: 6.7/10. Published 2024-02-14.
How severe is CVE-2023-49721?: Medium severity. CVSS v3 base score is 6.7 out of 10.