VulnerabilityModified

CVE-2021-34444

Windows DNS Server Denial of Service Vulnerability

MEDIUM 6.5EPSS 3.46%

Does this matter?

Lower severity and a low EPSS score (3.46%). Track it; it rarely justifies an emergency change on its own.

Description

Windows DNS Server Denial of Service Vulnerability

CVSS 3.1: 6.5 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS: 3.46% probability · 89th percentile
Public exploits: None in Exploit-DB
CISA KEV: Not listed
Affected: microsoft/windows server 2008 · microsoft/windows server 2012 · microsoft/windows server 2016 · microsoft/windows server 2019
Source: secure@microsoft.com

EPSS trend

EPSS 3.5% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34444
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34444Patch, Vendor Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.