ReviewHigh

CVE-2021-34503

Microsoft Windows 10 Version 1809, Windows 10 Version 1909, Windows Server 2019

CVE-2021-34503 affects Microsoft Windows 10 Version 1809, Windows 10 Version 1909, Windows Server 2019. Review the CVSS score, exploitation signals, affected versions, remediation status, and linked source material before making a change.

CVSS
7.8
EPSS
2.29%
82.0% percentile
CISA KEV
Not listed
Published
2021.07.15
PRIORITY ASSESSMENT

Review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability2.29%
Technical severityCVSS 7.8

Vulnerability overview

CVE-2021-34503 affects Microsoft Windows 10 Version 1809, Windows 10 Version 1909, Windows Server 2019. Review the CVSS score, exploitation signals, affected versions, remediation status, and linked source material before making a change.

Affected product and versions

Product
Microsoft Windows 10 Version 1809, Windows 10 Version 1909, Windows Server 2019
Affected versions
>= 10.0.17763.0 < 10.0.17763.2061, >= 10.0.0 < 10.0.17763.2061, >= 10.0.0 < 10.0.18363.1679, 1809, 1909
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. 1
    Identify

    Confirm that Microsoft Windows 10 Version 1809, Windows 10 Version 1909, Windows Server 2019 and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE
Not available