Microsoft Windows Server 2008 R2 Service Pack 1

CVE-2021-26895

CRITICAL 9.8

At a glance

Source: NVD
EPSS: EPSS 7.75 % · percentile 95 (2026-10-29)
State: PUBLISHED
Published: 2021-03-11 15:43 UTC
Updated: 2026-08-19 16:30 UTC
Assigner: microsoft
NVD status: Modified

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Description

Windows DNS Server Remote Code Execution Vulnerability

References

Scores

Version	Score	Vector	Scored by
CVSS 3.1	CRITICAL 9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C	microsoft
CVSS 3.1	CRITICAL 9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	NVD · secure@microsoft.com (Secondary)
CVSS 3.1	CRITICAL 9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	NVD · nvd@nist.gov (Secondary)
CVSS 2.0	HIGH 10.0	AV:N/AC:L/Au:N/C:C/I:C/A:C	NVD · nvd@nist.gov (Primary)

European references

ENISA EUVD · EUVD-2021-13679
GCVE · GCVE-0-2021-26895

CERT-FR advisories

CERTFR-2021-AVI-181 — Multiples vulnérabilités dans Microsoft Windows · cert.ssi.gouv.fr
CERTFR-2021-ALE-005 — Multiples vulnérabilités dans Microsoft DNS server · cert.ssi.gouv.fr

Affected configurations (NVD CPE)

cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2008:sp2:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2008:sp2:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:-:*:-:*
cpe:2.3:o:microsoft:windows_server_2016:-:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2016:20h2:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2016:1909:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2016:2004:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2019:-:*:*:*:*:*:*:*

Affected products

Product	Versions
Microsoft · Windows Server 2008 R2 Service Pack 1	affected 6.1.7601.0 < 6.1.7601.24566
Microsoft · Windows Server 2008 R2 Service Pack 1 (Server Core installation)	affected 6.1.7601.0 < 6.1.7601.24566
Microsoft · Windows Server 2008 Service Pack 2	affected 6.0.6003.0 < 6.0.6003.21070
Microsoft · Windows Server 2008 Service Pack 2 (Server Core installation)	affected 6.0.6003.0 < 6.0.6003.21070
Microsoft · Windows Server 2012	affected 6.2.9200.0 < 6.2.9200.23298
Microsoft · Windows Server 2012 (Server Core installation)	affected 6.2.9200.0 < 6.2.9200.23298
Microsoft · Windows Server 2012 R2	affected 6.3.9600.0 < 6.3.9600.19968
Microsoft · Windows Server 2012 R2 (Server Core installation)	affected 6.3.9600.0 < 6.3.9600.19968
Microsoft · Windows Server 2016	affected 10.0.14393.0 < 10.0.14393.4283
Microsoft · Windows Server 2016 (Server Core installation)	affected 10.0.14393.0 < 10.0.14393.4283
Microsoft · Windows Server 2019	affected 10.0.17763.0 < 10.0.17763.1817
Microsoft · Windows Server 2019 (Server Core installation)	affected 10.0.17763.0 < 10.0.17763.1817
Microsoft · Windows Server version 2004	affected 10.0.0 < 10.0.19043.867
Microsoft · Windows Server version 20H2	affected 10.0.0 < 10.0.19043.867
Microsoft · Windows Server, version 1909 (Server Core installation)	affected 10.0.0 < 10.0.18363.1440

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)	Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD