What is CVE-2022-21839?

CVE-2022-21839 is a medium-severity vulnerability in Microsoft Windows 10. CVSS score: 6.1/10. Published 2022-01-11.

How severe is CVE-2022-21839?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Is CVE-2022-21839 known to be exploited?

8 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Microsoft Windows 10

CVE-2022-21839

Windows Event Tracing Discretionary Access Control List Denial of Service Vulnerability

Published 2022-01-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H.

EPSS exploit prediction

EPSS: 0.015 (73.4th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 73rd percentile — 73.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.015 · newest: 0.015 · change: 0.000

Affected products

Microsoft Windows 10 — versions 1809
Microsoft Windows 10 Version 1809 — versions 10.0.17763.0, 10.0.0
Microsoft Windows Server 2019 — versions 10.0.17763.0
Microsoft Windows Server 2019
Microsoft Windows Server 2019 (Server Core Installation) — versions 10.0.17763.0

Public proof-of-concept exploits

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2022-21839 (vendor-advisory)
af854a3a-2127-422b-91ae-364da2661108

Frequently asked questions

What is CVE-2022-21839?: CVE-2022-21839 is a medium-severity vulnerability in Microsoft Windows 10. CVSS score: 6.1/10. Published 2022-01-11.
How severe is CVE-2022-21839?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2022-21839 known to be exploited?: 8 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.