ReviewCritical

CVE-2021-26894

Microsoft Windows Server 2008 R2 Service Pack 1, Windows Server 2008 R2 Service Pack 1 (Server Core installation), Windows Server 2008 Service Pack 2

CVE-2021-26894 affects Microsoft Windows Server 2008 R2 Service Pack 1, Windows Server 2008 R2 Service Pack 1 (Server Core installation), Windows Server 2008 Service Pack 2. Review the CVSS score, exploitation signals, affected versions, remediation status, and linked source material before making a change.

CVSS: 9.8
EPSS: 7.27%
CISA KEV: Not listed
Published: 2021.03.12

PRIORITY ASSESSMENT

Review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability7.27%

Technical severityCVSS 9.8

Vulnerability overview

Affected product and versions

Product: Microsoft Windows Server 2008 R2 Service Pack 1, Windows Server 2008 R2 Service Pack 1 (Server Core installation), Windows Server 2008 Service Pack 2
Affected versions: >= 6.1.7601.0 < 6.1.7601.24566, >= 6.0.6003.0 < 6.0.6003.21070, >= 6.2.9200.0 < 6.2.9200.23298, >= 6.3.9600.0 < 6.3.9600.19968, >= 10.0.14393.0 < 10.0.14393.4283, >= 10.0.17763.0 < 10.0.17763.1817, >= 10.0.0 < 10.0.19043.867, >= 10.0.0 < 10.0.18363.1440, r2, sp2, 20h2, 1909, 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
Identify
Confirm that Microsoft Windows Server 2008 R2 Service Pack 1, Windows Server 2008 R2 Service Pack 1 (Server Core installation), Windows Server 2008 Service Pack 2 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:N/S:U/C:H/I:H/A:H
CWE: Not available