CVE record · CVE-2021-43239

Windows Recovery Environment Agent Elevation of Privilege Vulnerability

CVSS 7.1 HighEPSS 0.0056 · 46th percentile

Published by the CVE Program (CNA: microsoft) at 15 Dec 2021, 14:15 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
Microsoft	Windows 10 Version 21H1	affected 10.0.0 to before 10.0.19043.1415 custom
Microsoft	Windows Server 2022	affected 10.0.0 to before 10.0.20348.405 custom
Microsoft	Windows 10 Version 2004	affected 10.0.0 to before 10.0.19041.1415 custom
Microsoft	Windows Server version 2004	affected 10.0.0 to before 10.0.19041.1415 custom
Microsoft	Windows 10 Version 20H2	affected 10.0.0 to before 10.0.19042.1415 custom
Microsoft	Windows Server version 20H2	affected 10.0.0 to before 10.0.19042.1415 custom
Microsoft	Windows 11 version 21H2	affected 10.0.0 to before 10.0.22000.376 custom
Microsoft	Windows 10 Version 21H2	affected 10.0.0 to before 10.0.19044.1415 custom

Identifiers: CVE-2021-43239
CNA: microsoft
Tags: Microsoft Windows 10 Version 21H1
Microsoft Windows Server 2022
Microsoft Windows 10 Version 2004
Microsoft Windows Server version 2004
Microsoft Windows 10 Version 20H2
Microsoft Windows Server version 20H2
Microsoft Windows 11 version 21H2
Microsoft Windows 10 Version 21H2
Published: 15 Dec 2021
Updated: 4 Aug 2024

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
7.1	High	3.1	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H/E:U/RL:O/RC:C	CNA (microsoft)

CISA KEV Not listed.
EPSS 0.0056, the 46th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 15 Dec 2021. New records show when each source confirmed them.

Sources

References from the CNA

portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-43239

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.