Windows DNS Server Denial of Service Vulnerability

2019-07-0907:00:00

Microsoft

msrc.microsoft.com

CVSS2

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

AV:N/AC:L/Au:N/C:N/I:N/A:P

CVSS3

7.5

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS

0.003

Percentile

68.3%

JSON

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.