CVE-2023-49721

MEDIUMNVD 6.76.7—

6.7

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

CVSS v3: 6.7
EG Score: 6.7(medium)
EPSS: 3.9%
KEV: Not listed

Published

February 14, 2024

Last Modified

August 26, 2025

References (8)

security@ubuntuhttps://bugs.launchpad.net/ubuntu/+source/edk2/+bug/2040137
security@ubuntuhttps://bugs.launchpad.net/ubuntu/+source/lxd/+bug/2040139
security@ubuntuhttps://nvd.nist.gov/vuln/detail/CVE-2023-48733
security@ubuntuhttps://www.openwall.com/lists/oss-security/2024/02/14/4
af854a3a-2127-422b-91ae-364da2661108https://bugs.launchpad.net/ubuntu/+source/edk2/+bug/2040137
af854a3a-2127-422b-91ae-364da2661108https://bugs.launchpad.net/ubuntu/+source/lxd/+bug/2040139
af854a3a-2127-422b-91ae-364da2661108https://nvd.nist.gov/vuln/detail/CVE-2023-48733
af854a3a-2127-422b-91ae-364da2661108https://www.openwall.com/lists/oss-security/2024/02/14/4

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-276Incorrect Default Permissions

Data Freshness Timeline

(refreshed 12× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-04 13:11 UTCepss_batch
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Frequently asked(5)

What is CVE-2023-49721?

CVE-2023-49721 is a medium vulnerability published on February 14, 2024. An insecure default to allow UEFI Shell in EDK2 was left enabled in LXD. This allows an OS-resident attacker to bypass Secure Boot.

When was CVE-2023-49721 disclosed?

CVE-2023-49721 was first published in the National Vulnerability Database on February 14, 2024, with the most recent update on August 26, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2023-49721 actively exploited?

CVE-2023-49721 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 3.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2023-49721?

CVE-2023-49721 has a CVSS v3 base score of 6.7 (NVD).

How do I remediate CVE-2023-49721?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-49721, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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CVE-2023-49721

📅 Published

🔄 Last Modified

🔗 References (8)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2023-49721?

🔗 Related CVEs(same CWE)

Same CWE

Published

Last Modified

References (8)

Frequently asked(5)

Related CVEs(same CWE)