CVE-2019-0811 — Windows DNS Server Denial of Service Vulnerability

Executive Summary

A denial of service vulnerability exists in Windows DNS Server when it fails to properly handle DNS queries. An attacker who successfully exploited this vulnerability could cause the DNS Server service to become nonresponsive. To exploit the vulnerability, an unauthenticated attacker could send malicious DNS queries to an affected server, resulting in a denial of service. However, the DNS server must be configured to use DNS Analytical Logging for the attack to succeed. The update addresses the vulnerability by correcting how Windows DNS Server processes DNS queries.

Overview

7.5

CVSS HIGH

Important

MS Severity

Not Exploited

MS Exploit Status

Less Likely

MS Exploit Likelihood

Category Denial of Service

Released Jul 9 2019

Last Updated Jul 9 2019

Publicly Disclosed No

CISA KEV Not Listed

Known Exploits None Known

EPSS Score 0.04502 — 0.90505 percentile

NVD CVSS 7.5 HIGH — matches MSRC

CVSS Vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C

ATTACK VECTOR

Network

ATTACK COMPLEXITY

Low

PRIVILEGES REQUIRED

None

USER INTERACTION

None

SCOPE

Unchanged

CONFIDENTIALITY

None

INTEGRITY

None

AVAILABILITY

High

EXPLOIT CODE MATURITY

Proof-of-Concept

REMEDIATION LEVEL

Official Fix

REPORT CONFIDENCE

Confirmed

Temporal Score: 6.7

EPSS Score

0.04502

probability of exploitation in the next 30 days

0.90505 percentile - updated 2026-07-25

View on FIRST.org

Affected Products

6 affected products

Product	KB Article	Severity	Impact	Restart Required
Windows Server 2012 R2 4507448 (Monthly Rollup) 4507457 (Security Only) Important Denial of Service 4503276 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C Yes None Windows Server 2012 R2 (Server Core installation) 4507448 (Monthly Rollup) 4507457 (Security Only) Important Denial of Service 4503276 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C Yes None Windows Server 2016	`4507460 (Security Update)`	Important	Denial of Service	Yes
Windows Server 2016 (Server Core installation)	`4507460 (Security Update)`	Important	Denial of Service	Yes
Windows Server 2019	`4507469 (Security Update)`	Important	Denial of Service	Yes
Windows Server 2019 (Server Core installation)	`4507469 (Security Update)`	Important	Denial of Service	Yes
Windows Server, version 1803 (Server Core Installation)	`4507435 (Security Update)`	Important	Denial of Service	Yes
Windows Server, version 1903 (Server Core installation)	`4507453 (Security Update)`	Important	Denial of Service	Yes

Patches

4 patches

Article	Type	Restart
`4507460`	Security Update	Yes
`4507469`	Security Update	Yes
`4507435`	Security Update	Yes
`4507453`	Security Update	Yes

Known Exploits

No known exploits have been linked for this CVE yet. When available, exploit references will be sourced from public repositories and may be unverified, incomplete, or non-functional. Always review code carefully before use in any environment.

Acknowledgments

None

References

MSRC Advisory MITRE NVD