CVE-2023-49721
An insecure default to allow UEFI Shell in EDK2 was left enabled in LXD. This allows an OS...
An insecure default to allow UEFI Shell in EDK2 was left enabled in LXD. This allows an OS-resident attacker to bypass Secure Boot.
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- Low
- Privileges needed
- High
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
An insecure default to allow UEFI Shell in EDK2 was left enabled in LXD. This allows an OS-resident attacker to bypass Secure Boot.
- Record
CVE-2023-49721- CVSS 3.1
- 6.7 Medium
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-276
- Updated
- 2026-11-02
EUVDEUVD-2023-53649
An insecure default to allow UEFI Shell in EDK2 was left enabled in LXD. This allows an OS-resident attacker to bypass Secure Boot.
- Record
EUVD-2023-53649- CVSS 3.1
- 6.7 Medium
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-4639-7gfm-29p2
An insecure default to allow UEFI Shell in EDK2 was left enabled in LXD. This allows an OS...
An insecure default to allow UEFI Shell in EDK2 was left enabled in LXD. This allows an OS-resident attacker to bypass Secure Boot.
- Record
GHSA-4639-7gfm-29p2- CVSS 3.1
- 6.7 Medium
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-276
- Updated
- 2026-11-02
NVD
An insecure default to allow UEFI Shell in EDK2 was left enabled in LXD. This allows an OS-resident attacker to bypass Secure Boot.
- Record
CVE-2023-49721- CVSS 3.1
- 6.7 Medium
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-276
- Updated
- 2026-11-02
OSV
An insecure default to allow UEFI Shell in EDK2 was left enabled in LXD. This allows an OS-resident attacker to bypass Secure Boot.
- Record
CVE-2023-49721- CVSS 3.1
- 6.7 Medium
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSVOESA-2026-4033
edk2 security update
EDK II is a modern, feature-rich, cross-platform firmware development environment for the UEFI and PI specifications.
Security Fix(es):
An insecure default to allow UEFI Shell in EDK2 was left enabled in LXD. This allows an OS-resident attacker to bypass Secure Boot.(CVE-2023-49721)
- Record
OESA-2026-4033- CVSS 3.1
- 6.7 Medium
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSVOESA-2026-4217
edk2 security update
EDK II is a modern, feature-rich, cross-platform firmware development environment for the UEFI and PI specifications.
Security Fix(es):
An insecure default to allow UEFI Shell in EDK2 was left enabled in LXD. This allows an OS-resident attacker to bypass Secure Boot.(CVE-2023-49721)
- Record
OESA-2026-4217- CVSS 3.1
- 6.7 Medium
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
Affected products
Affected packages
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases, published | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2023-49721 is a medium vulnerability (CVSS 6.7) in Canonical Lxd, published February 14, 2024. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.24%, the 14th percentile. Fixed in edk2 202308-49.oe2403sp3.
References
bugs.launchpad.net/ubuntu/+source/lxd/+bug/2040139
nvd.nist.gov/vuln/detail/CVE-2023-48733
openwall.com/lists/oss-security/2024/02/14/4
github.com/advisories/GHSA-4639-7gfm-29p2
openeuler.org/zh/security/security-bulletins/detail?id=openEuler-SA-2026-4033