VulnTideExploited vulnerabilities, by vendor. Data as of .
Not in CISA KEVReported exploited: VulnCheck KEV since Published CVSS 9.8 criticalEPSS 11.6% probability of exploitation in 30 days
Microsoft

CVE-2021-26897: Windows DNS Server Remote Code Execution Vulnerability

Is it exploited?

Reported, not confirmed by CISA. VulnCheck KEV lists it as exploited in the wild. CISA has not added it to its Known Exploited Vulnerabilities catalog as of .

VulnCheck KEV lists it since . It cites 4 public reports, the first from .

How likely is exploitation in the next 30 days?
11.6%

EPSS score, percentile 96 of all scored records. A probability estimated by FIRST, not a report of exploitation.

How severe?
9.8 Critical

CVSS v3.1 base score, given by the CNA

What should I do?

CISA has set no required action, because the vulnerability is not in KEV.

Advisories and patches (1)

Which versions are affected?

Affected

  • from 6.1.7601.0 to before 6.1.7601.24566
  • from 6.1.7601.0 to before 6.1.7601.24566
  • from 6.0.6003.0 to before 6.0.6003.21070
  • from 6.0.6003.0 to before 6.0.6003.21070
  • from 6.2.9200.0 to before 6.2.9200.23298
  • from 6.2.9200.0 to before 6.2.9200.23298

and 9 more in the table below

Versions by product

Source: CISA KEV 2026.10.29, as of ; VulnCheck KEV, as of ; FIRST EPSS, as of ; CVE List, as of . About the data.

Description

Windows DNS Server Remote Code Execution Vulnerability

Windows DNS Server Remote Code Execution Vulnerability

Source: CVE List, as of . About the data.

What to do

Advisories and patches

This summary is based on the CVE record as of . Check the vendor's advisory before you act: affected versions and fixes can change.

Affected products and versions

Versions by product, as listed in the CVE record (15 products)
Microsoft Windows Server 2008 R2 Service Pack 1
StatusVersions
Affectedfrom 6.1.7601.0 to before 6.1.7601.24566
Microsoft Windows Server 2008 R2 Service Pack 1 (Server Core installation)
StatusVersions
Affectedfrom 6.1.7601.0 to before 6.1.7601.24566
Microsoft Windows Server 2008 Service Pack 2
StatusVersions
Affectedfrom 6.0.6003.0 to before 6.0.6003.21070
Microsoft Windows Server 2008 Service Pack 2 (Server Core installation)
StatusVersions
Affectedfrom 6.0.6003.0 to before 6.0.6003.21070
Microsoft Windows Server 2012
StatusVersions
Affectedfrom 6.2.9200.0 to before 6.2.9200.23298
Microsoft Windows Server 2012 (Server Core installation)
StatusVersions
Affectedfrom 6.2.9200.0 to before 6.2.9200.23298
Microsoft Windows Server 2012 R2
StatusVersions
Affectedfrom 6.3.9600.0 to before 6.3.9600.19968
Microsoft Windows Server 2012 R2 (Server Core installation)
StatusVersions
Affectedfrom 6.3.9600.0 to before 6.3.9600.19968
Microsoft Windows Server 2016
StatusVersions
Affectedfrom 10.0.14393.0 to before 10.0.14393.4283
Microsoft Windows Server 2016 (Server Core installation)
StatusVersions
Affectedfrom 10.0.14393.0 to before 10.0.14393.4283
Microsoft Windows Server 2019
StatusVersions
Affectedfrom 10.0.17763.0 to before 10.0.17763.1817
Microsoft Windows Server 2019 (Server Core installation)
StatusVersions
Affectedfrom 10.0.17763.0 to before 10.0.17763.1817
Microsoft Windows Server version 2004
StatusVersions
Affectedfrom 10.0.0 to before 10.0.19043.867
Microsoft Windows Server version 20H2
StatusVersions
Affectedfrom 10.0.0 to before 10.0.19043.867
Microsoft Windows Server, version 1909 (Server Core installation)
StatusVersions
Affectedfrom 10.0.0 to before 10.0.18363.1440

Source: CVE List, as of . About the data.

Timeline

DateEvent
CVE record published
CVE record last updated

Known exploited Microsoft vulnerabilities

  • CVE-2026-96951: Microsoft Windows Command Injection Vulnerability (added )
  • CVE-2026-65660: Microsoft SharePoint Code Injection Vulnerability (added )
  • CVE-2026-81963: Microsoft Windows Link Following Vulnerability (added )
  • CVE-2026-85880: Microsoft Windows Heap-Based Buffer Overflow Vulnerability (added )
  • CVE-2019-1068: Microsoft SQL Server Remote Code Execution Vulnerability (added )