CVE-2023-27471

An issue was discovered in Insyde InsydeH2O with kernel 5.0 through 5.5. UEFI implementations do not correctly protect and validate information contained in the 'MeSetup' UEFI variable. On some systems, this variable can be overwritten using operating system APIs. Exploitation of this vulnerability could potentially lead to denial of service for the platform.

Published: 2023-08-18 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2023-27471 is rated Low Risk (24.1/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.16%). 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-2023-27471

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 2026-06-15 0.04% 0.16% +0.12%
2 2026-06-03 0.06% 0.04% -0.01%
3 2026-02-18 — 0.06% —

Full EPSS history (10 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2023-27471

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.5 3.1 MEDIUM
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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:L)
A normal user session is enough; they don’t have to be admin.
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:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.8 3.6 [email protected]

Weakness enumeration for CVE-2023-27471

Affected software / configurations for CVE-2023-27471

Vendor Product Version Raw CPE
insyde insydeh2o 5.0 cpe:2.3:a:insyde:insydeh2o:5.0:*:*:*:*:*:*:*
insyde insydeh2o 5.1 cpe:2.3:a:insyde:insydeh2o:5.1:*:*:*:*:*:*:*
insyde insydeh2o 5.2 cpe:2.3:a:insyde:insydeh2o:5.2:*:*:*:*:*:*:*
insyde insydeh2o 5.3 cpe:2.3:a:insyde:insydeh2o:5.3:*:*:*:*:*:*:*
insyde insydeh2o 5.4 cpe:2.3:a:insyde:insydeh2o:5.4:*:*:*:*:*:*:*
insyde insydeh2o 5.5 cpe:2.3:a:insyde:insydeh2o:5.5:*:*:*:*:*:*:*

References for CVE-2023-27471

cvelogic Threat Intelligence