Is CVE-2023-49721 in the CISA KEV catalog?

No. CVE-2023-49721 is not currently on the CISA Known Exploited Vulnerabilities list.

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

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

What is the EPSS score for CVE-2023-49721?

CVE-2023-49721 has an EPSS score of 0.24% (15th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2023-49721?

Upgrade lxd to 5.21.0 or later.

CVE & CISA-KEV Catalog

CVE-2023-49721

MEDIUM

6.7

CVSS v3

NVD

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.

CWE-276

How to fix

Remediation Available

lxdNVD

Affected:>= 5.0.0, < 5.21.0Fixed in:5.21.0CVE-2023-49721derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredHigh

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

0.24%probability of exploitation in 30 days

15thpercentile

Low risk: more likely to be exploited than 15% of all known CVEs.

References

Third-Party Advisory1

nvd.nist.gov

Issue Tracking2

Mailing List1

openwall.com

Related Vulnerabilities

Other CWE-276 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2013-0632	Critical	9.8	94%	KEV	-
CVE-2017-11610	High	8.8	88%	-	Fix
CVE-2023-29919	Critical	9.1	60%	-	-
CVE-2019-17124	Critical	9.8	23%	-	-
CVE-2020-12608	High	7.8	22%	-	Fix
CVE-2021-3437	Critical	9.8	16%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-08-26.