CVE-2023-48733 json
An insecure default to allow UEFI Shell in EDK2 was left enabled in Ubuntu's EDK2.
published 2024-02-14 2 y ago modified 2026-06-17 4 mo ago also EUVD-2023-52766
- cvss
- 6.7
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 17%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- Canonical Ltd. Ubuntu EDK II 2023.05-2ubuntu0.1
- edk2 Debian 12 2022.11-6+deb12u1
- edk2 Debian 14, Debian 13 2023.11-7
debian advisories DEBIAN-CVE-2023-48733
- edk2 Ubuntu 20.04 LTS 0~20191122.bd85bf54-2ubuntu3.5
- edk2 Ubuntu 22.04 LTS 2022.02-3ubuntu0.22.04.2
ubuntu advisories UBUNTU-CVE-2023-48733
Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0
- ovmf openSUSE Tumbleweed 202308-7.1
opensuse advisories openSUSE-SU-2024:13807-1
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- total
- Assessed
- 2 y ago
Exploit prediction
0.26% chance of exploitation in the next 30 days, higher than 17% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.7 | CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H |
Affected products
- Canonical Ltd. Ubuntu EDK II
Classification
- Weakness
-
- CWE-1188 Initialization of a Resource with an Insecure Default
References
-
bugs.launchpad.net
/ubuntu/+source/edk2/+bug/2040137
issue-tracking
-
nvd.nist.gov
/vuln/detail/CVE-2023-48733
issue-tracking, third-party-advisory
-
openwall.com
/lists/oss-security/2024/02/14/4
mailing-list
-
bugs.launchpad.net
/ubuntu/+source/lxd/+bug/2040139
issue-tracking
-
lists.debian.org
/debian-lts-announce/2024/06/msg00028.html
mailing-list
Sources
- CVE List CVE-2023-48733
- NVD CVE-2023-48733
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.