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CVE-2021-34458

Microsoft Windows Server 2016, Windows Server 2016 (Server Core installation), Windows Server 2019

CVE-2021-34458 affects Microsoft Windows Server 2016, Windows Server 2016 (Server Core installation), Windows Server 2019. Review the CVSS score, exploitation signals, affected versions, remediation status, and linked source material before making a change.

CVSS
9.9
EPSS
2.63%
84.4% percentile
CISA KEV
Not listed
Published
2021.07.17
PRIORITY ASSESSMENT

Review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability2.63%
Technical severityCVSS 9.9

Vulnerability overview

CVE-2021-34458 affects Microsoft Windows Server 2016, Windows Server 2016 (Server Core installation), 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 Server 2016, Windows Server 2016 (Server Core installation), Windows Server 2019
Affected versions
>= 10.0.14393.0 < 10.0.14393.4530, >= 10.0.17763.0 < 10.0.17763.2061, >= 10.0.0 < 10.0.19041.1110, >= 10.0.0 < 10.0.19042.1110, 20h2, 2004
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 Server 2016, Windows Server 2016 (Server Core installation), 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:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CWE
Not available