# CVE-2023-48733: edk2: An insecure default to allow UEFI Shell in EDK2 was left enabled in Ubuntu's EDK2

CVE-2023-48733 is fixed in 12 products on 1 platform, first by ovmf 0~20191122.bd85bf54-2ubuntu3.5, released February 13, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2023-48733
- Priority: Routine
- CVSS: 6.7 (medium)
- EPSS: 0.0026
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 13, 2024

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | edk2 Debian 11.6 (bullseye) | 2020.11-2+deb11u2 | [DSA-5624-1](https://patchblox.com/security/data/fix/linux/dsa-5624-1.md) | Feb 14, 2024 |
| Linux | edk2 Debian 12.15 (bookworm) | 2022.11-6+deb12u1 | [DSA-5624-1](https://patchblox.com/security/data/fix/linux/dsa-5624-1.md) | Feb 14, 2024 |
| Linux | edk2 Debian 13.5 (trixie) | 2023.11-7 | [DEBIAN-CVE-2023-48733](https://patchblox.com/security/data/fix/linux/debian-cve-2023-48733.md) | Feb 14, 2024 |
| Linux | edk2 Debian 14 | 2023.11-7 | [DEBIAN-CVE-2023-48733](https://patchblox.com/security/data/fix/linux/debian-cve-2023-48733.md) | Feb 14, 2024 |
| Linux | efi-shell-aa64 Ubuntu 24.10 (oracular) | 2023.11-7 | [efi-shell-aa64 2023.11-7](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-efi-shell-aa64-2023.11-7.md) | Feb 14, 2024 |
| Linux | efi-shell-aa64 Ubuntu 25.04 (plucky) | 2023.11-7 | [efi-shell-aa64 2023.11-7](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-efi-shell-aa64-2023.11-7.md) | Feb 14, 2024 |
| Linux | efi-shell-arm Ubuntu 24.10 (oracular) | 2023.11-7 | [efi-shell-arm 2023.11-7](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-efi-shell-arm-2023.11-7.md) | Feb 14, 2024 |
| Linux | efi-shell-arm Ubuntu 25.04 (plucky) | 2023.11-7 | [efi-shell-arm 2023.11-7](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-efi-shell-arm-2023.11-7.md) | Feb 14, 2024 |
| Linux | efi-shell-ia32 Ubuntu 24.10 (oracular) | 2023.11-7 | [efi-shell-ia32 2023.11-7](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-efi-shell-ia32-2023.11-7.md) | Feb 14, 2024 |
| Linux | efi-shell-ia32 Ubuntu 25.04 (plucky) | 2023.11-7 | [efi-shell-ia32 2023.11-7](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-efi-shell-ia32-2023.11-7.md) | Feb 14, 2024 |
| Linux | efi-shell-riscv64 Ubuntu 24.10 (oracular) | 2023.11-7 | [efi-shell-riscv64 2023.11-7](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-efi-shell-riscv64-2023.11-7.md) | Feb 14, 2024 |
| Linux | efi-shell-riscv64 Ubuntu 25.04 (plucky) | 2023.11-7 | [efi-shell-riscv64 2023.11-7](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-efi-shell-riscv64-2023.11-7.md) | Feb 14, 2024 |
| Linux | efi-shell-x64 Ubuntu 24.10 (oracular) | 2023.11-7 | [efi-shell-x64 2023.11-7](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-efi-shell-x64-2023.11-7.md) | Feb 14, 2024 |
| Linux | efi-shell-x64 Ubuntu 25.04 (plucky) | 2023.11-7 | [efi-shell-x64 2023.11-7](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-efi-shell-x64-2023.11-7.md) | Feb 14, 2024 |
| Linux | ovmf Ubuntu 20.04 LTS (focal) | 0~20191122.bd85bf54-2ubuntu3.5 | [ovmf 0~20191122.bd85bf54-2ubuntu3.5](https://patchblox.com/security/data/fix/linux/ubuntu-focal-ovmf-0-20191122.bd85bf54-2ubuntu3.5.md) | Feb 13, 2024 |
| Linux | ovmf Ubuntu 22.04.1 LTS (jammy) | 2022.02-3ubuntu0.22.04.2 | [ovmf 2022.02-3ubuntu0.22.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-ovmf-2022.02-3ubuntu0.22.04.2.md) | Feb 13, 2024 |
| Linux | ovmf Ubuntu 24.10 (oracular) | 2023.11-7 | [ovmf 2023.11-7](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-ovmf-2023.11-7.md) | Feb 14, 2024 |
| Linux | ovmf Ubuntu 25.04 (plucky) | 2023.11-7 | [ovmf 2023.11-7](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-ovmf-2023.11-7.md) | Feb 14, 2024 |
| Linux | ovmf-ia32 Ubuntu 22.04.1 LTS (jammy) | 2022.02-3ubuntu0.22.04.2 | [ovmf-ia32 2022.02-3ubuntu0.22.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-ovmf-ia32-2022.02-3ubuntu0.22.04.2.md) | Feb 13, 2024 |
| Linux | ovmf-ia32 Ubuntu 24.10 (oracular) | 2023.11-7 | [ovmf-ia32 2023.11-7](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-ovmf-ia32-2023.11-7.md) | Feb 14, 2024 |
| Linux | ovmf-ia32 Ubuntu 25.04 (plucky) | 2023.11-7 | [ovmf-ia32 2023.11-7](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-ovmf-ia32-2023.11-7.md) | Feb 14, 2024 |
| Linux | qemu-efi Ubuntu 20.04 LTS (focal) | 0~20191122.bd85bf54-2ubuntu3.5 | [qemu-efi 0~20191122.bd85bf54-2ubuntu3.5](https://patchblox.com/security/data/fix/linux/ubuntu-focal-qemu-efi-0-20191122.bd85bf54-2ubuntu3.5.md) | Feb 13, 2024 |
| Linux | qemu-efi Ubuntu 22.04.1 LTS (jammy) | 2022.02-3ubuntu0.22.04.2 | [qemu-efi 2022.02-3ubuntu0.22.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-qemu-efi-2022.02-3ubuntu0.22.04.2.md) | Feb 13, 2024 |
| Linux | qemu-efi-aarch64 Ubuntu 20.04 LTS (focal) | 0~20191122.bd85bf54-2ubuntu3.5 | [qemu-efi-aarch64 0~20191122.bd85bf54-2ubuntu3.5](https://patchblox.com/security/data/fix/linux/ubuntu-focal-qemu-efi-aarch64-0-20191122.bd85bf54-2ubuntu3.5.md) | Feb 13, 2024 |
| Linux | qemu-efi-aarch64 Ubuntu 22.04.1 LTS (jammy) | 2022.02-3ubuntu0.22.04.2 | [qemu-efi-aarch64 2022.02-3ubuntu0.22.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-qemu-efi-aarch64-2022.02-3ubuntu0.22.04.2.md) | Feb 13, 2024 |
| Linux | qemu-efi-aarch64 Ubuntu 24.10 (oracular) | 2023.11-7 | [qemu-efi-aarch64 2023.11-7](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-qemu-efi-aarch64-2023.11-7.md) | Feb 14, 2024 |
| Linux | qemu-efi-aarch64 Ubuntu 25.04 (plucky) | 2023.11-7 | [qemu-efi-aarch64 2023.11-7](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-qemu-efi-aarch64-2023.11-7.md) | Feb 14, 2024 |
| Linux | qemu-efi-arm Ubuntu 20.04 LTS (focal) | 0~20191122.bd85bf54-2ubuntu3.5 | [qemu-efi-arm 0~20191122.bd85bf54-2ubuntu3.5](https://patchblox.com/security/data/fix/linux/ubuntu-focal-qemu-efi-arm-0-20191122.bd85bf54-2ubuntu3.5.md) | Feb 13, 2024 |
| Linux | qemu-efi-arm Ubuntu 22.04.1 LTS (jammy) | 2022.02-3ubuntu0.22.04.2 | [qemu-efi-arm 2022.02-3ubuntu0.22.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-qemu-efi-arm-2022.02-3ubuntu0.22.04.2.md) | Feb 13, 2024 |
| Linux | qemu-efi-arm Ubuntu 24.10 (oracular) | 2023.11-7 | [qemu-efi-arm 2023.11-7](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-qemu-efi-arm-2023.11-7.md) | Feb 14, 2024 |
| Linux | qemu-efi-arm Ubuntu 25.04 (plucky) | 2023.11-7 | [qemu-efi-arm 2023.11-7](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-qemu-efi-arm-2023.11-7.md) | Feb 14, 2024 |
| Linux | qemu-efi-riscv64 Ubuntu 24.10 (oracular) | 2023.11-7 | [qemu-efi-riscv64 2023.11-7](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-qemu-efi-riscv64-2023.11-7.md) | Feb 14, 2024 |
| Linux | qemu-efi-riscv64 Ubuntu 25.04 (plucky) | 2023.11-7 | [qemu-efi-riscv64 2023.11-7](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-qemu-efi-riscv64-2023.11-7.md) | Feb 14, 2024 |

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Data as of 2026-11-08T00:53:09Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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