Priority reviewHigh

CVE-2021-34480

Microsoft Windows 10 Version 1507, Windows 10 Version 1607, Windows 10 Version 1809

CVE-2021-34480 affects Microsoft Windows 10 Version 1507, Windows 10 Version 1607, Windows 10 Version 1809. Review the CVSS score, exploitation signals, affected versions, remediation status, and linked source material before making a change.

CVSS: 8.8
EPSS: 39.8%
CISA KEV: Not listed
Published: 2021.08.13

PRIORITY ASSESSMENT

Priority review

FIRST EPSS indicates an elevated probability of exploitation.

Known exploitationNot established by KEV

Exploit probability39.8%

Technical severityCVSS 8.8

Vulnerability overview

Affected product and versions

Product: Microsoft Windows 10 Version 1507, Windows 10 Version 1607, Windows 10 Version 1809
Affected versions: >= 10.0.10240.0 < 10.0.10240.19022, >= 10.0.14393.0 < 10.0.14393.4583, >= 10.0.17763.0 < 10.0.17763.2114, >= 10.0.0 < 10.0.17763.2114, >= 10.0.0 < 10.0.18363.1734, >= 10.0.0 < 10.0.19041.1165, >= 10.0.0 < 10.0.19042.1165, >= 10.0.0 < 10.0.19043.1165, >= 6.1.0 < 6.1.7601.25685, >= 6.3.0 < 6.3.9600.20094, >= 6.1.7601.0 < 6.1.7601.25685, >= 6.2.9200.0 < 6.2.9200.23435, >= 6.3.9600.0 < 6.3.9600.20094, 20h2, 21h1, 1607, 1809, 1909, 2004, r2
Fixed versions: No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

1
Identify
Confirm that Microsoft Windows 10 Version 1507, Windows 10 Version 1607, Windows 10 Version 1809 and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE: CWE-787