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CVE-2019-1206: Windows DHCP Server Denial of Service Vulnerability

• Severity: medium (CVSS 5.0 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 5.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-08-14 · updated 2026-06-17
• Weakness: CWE-787

Description

A memory corruption vulnerability exists in the Windows Server DHCP service when an attacker sends specially crafted packets to a DHCP failover server. An attacker who successfully exploited the vulnerability could cause the DHCP service to become nonresponsive. To exploit the vulnerability, an attacker could send a specially crafted packet to a DHCP server. However, the DHCP server must be set to failover mode for the attack to succeed. The security update addresses the vulnerability by correcting how DHCP failover servers handle network packets.

Affected products

• Microsoft Windows Server 2012: r2
• Microsoft Windows Server 2016: 1803, 1903
• Microsoft Windows Server 2019: all versions
• Microsoft Windows Server 2012: from 6.2.0 before publication — fixed in publication
• Microsoft Windows Server 2012 R2: from 6.3.0 before publication — fixed in publication
• Microsoft Windows Server 2016: from 10.0.0 before publication — fixed in publication
• Microsoft Windows Server 2019: from 10.0.0 before publication — fixed in publication
• Microsoft Windows Server, version 1803 (Server Core Installation): from 10.0.0 before publication — fixed in publication
• Microsoft Windows Server, version 1903 (Server Core installation): from 10.0.0 before publication — fixed in publication

How to fix

Upgrade to a fixed version: Microsoft Windows Server 2012 publication; Microsoft Windows Server 2012 R2 publication; Microsoft Windows Server 2016 publication; Microsoft Windows Server 2019 publication; Microsoft Windows Server, version 1803 (Server Core Installation) publication; Microsoft Windows Server, version 1903 (Server Core installation) publication. Check the vendor advisory for mitigations.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1206
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1206

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