What’s Vulnerable › Vulnerabilities

CVE-2023-49721

• Severity: medium (CVSS 6.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-02-14 · updated 2026-06-17
• Weakness: CWE-276

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.

Affected products

• Canonical LXD: from 5.0.0 before 5.21.0 — fixed in 5.21.0
• TianoCore edk2: through 2023.11-8

How to fix

Upgrade to a fixed version: Canonical LXD 5.21.0. Check the vendor advisory for mitigations.

References

• https://bugs.launchpad.net/ubuntu/+source/edk2/+bug/2040137
• https://bugs.launchpad.net/ubuntu/+source/lxd/+bug/2040139
• https://nvd.nist.gov/vuln/detail/CVE-2023-48733
• https://www.openwall.com/lists/oss-security/2024/02/14/4
• https://bugs.launchpad.net/ubuntu/+source/edk2/+bug/2040137
• https://bugs.launchpad.net/ubuntu/+source/lxd/+bug/2040139
• https://nvd.nist.gov/vuln/detail/CVE-2023-48733
• https://www.openwall.com/lists/oss-security/2024/02/14/4

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