CVE-2023-48733

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.

Published: 2024-02-14 Last update: 2025-08-26 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2023-48733 is rated Low Risk (27.1/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.01%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2023-48733

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-11-21 0.07% 0.01% -0.05%
2 2025-11-18 0.00% 0.07% +0.06%
3 2025-04-15 — 0.00% —

Full EPSS history (5 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2023-48733

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.7 3.1 MEDIUM
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:H)
They need powerful rights—admin, root, or similar—before this pays off.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 0.8 5.9 [email protected]

Weakness enumeration for CVE-2023-48733

OS Trackers for CVE-2023-48733

vendor priority summary link
alpine — CVE-2023-48733: 1 source package rows (edk2); 8 state rows across 3 repos (3.22-community, 3.23-community, edge-community); fixed 0, open 8. https://security.alpinelinux.org/vuln/CVE-2023-48733
debian not yet assigned CVE-2023-48733 not yet assigned priority: Debian including 1 source packages (edk2), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2023-48733
suse medium CVE-2023-48733 severity moderate: SUSE including 24 source package names (ovmf, ovmf-202308-7.1, …), 49 product×package rows across 11 product lines (SUSE Linux Enterprise High Performance Computing 15 SP2-LTSS, SUSE Linux Enterprise Module for Confidential Computing 15 SP6, … (11 product lines)): Known Not Affected 31, Fixed 18. https://www.suse.com/security/cve/CVE-2023-48733/
ubuntu medium CVE-2023-48733 medium priority: Ubuntu including 1 source packages (edk2), 12 status rows across 12 suites (bionic, focal, jammy, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): released 7, needs-triage 3, ignored 2. https://ubuntu.com/security/CVE-2023-48733

Affected software / configurations for CVE-2023-48733

Vendor Product Version Raw CPE
canonical lxd 5.0 cpe:2.3:a:canonical:lxd:5.0:candidate:*:*:*:*:*:*
canonical lxd 5.21 cpe:2.3:a:canonical:lxd:5.21:candidate:*:*:*:*:*:*
canonical lxd 5.21 cpe:2.3:a:canonical:lxd:5.21:edge:*:*:*:*:*:*
tianocore edk2 <= 2023.11-8 cpe:2.3:a:tianocore:edk2:*:-:*:*:*:*:*:*
debian debian_linux 10.0 cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*

References for CVE-2023-48733

cvelogic Threat Intelligence