CVE-2021-42059

Stack overflow vulnerability that allows a local root user to access UEFI DXE driver and execute...

6.7 Medium

An issue was discovered in Insyde InsydeH2O Kernel 5.0 before 05.08.41, Kernel 5.1 before 05.16.41, Kernel 5.2 before 05.26.41, Kernel 5.3 before 05.35.41, and Kernel 5.4 before 05.42.20. A stack-based buffer overflow leads toarbitrary code execution in UEFI DisplayTypeDxe DXE driver.

Attack profile

How easy it is to exploit

Attack vector: Local
Complexity: Low
Privileges needed: High
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

0.35%Down 0.4 points since Feb 3, 2022

What each source reports

NVD Score used 6.7

Record: CVE-2021-42059
CVSS 3.1: 6.7 MediumCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0: 7.2 HighAV:L/AC:L/Au:N/C:C/I:C/A:C
Weakness: CWE-787
Updated: 2026-11-02

CVE List No score

Record: CVE-2021-42059
Updated: 2026-11-02

EUVDEUVD-2021-29045 No score

Record: EUVD-2021-29045
Updated: 2026-11-02

GitHub AdvisoriesGHSA-27rf-x255-jv68 6.7

Stack overflow vulnerability that allows a local root user to access UEFI DXE driver and execute...

Stack overflow vulnerability that allows a local root user to access UEFI DXE driver and execute arbitrary code.

Record: GHSA-27rf-x255-jv68
CVSS 3.1: 6.7 MediumCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-787
Updated: 2026-11-02

Affected products

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History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-42059 is a medium vulnerability (CVSS 6.7) in Insyde Insydeh2o, published February 3, 2022. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.35%, the 28th percentile. No source names a fixed version.