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Severity by source

Vendor (microsoft) PRIMARY
9.8 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
ENISA EUVD
HIGH
qualitative

Primary rating from Vendor (microsoft).

CVSS VectorVendor: microsoft

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

2
Analysis Generated
Jul 14, 2026 - 19:12 vuln.today
CVE Published
Jul 14, 2026 - 17:09 nvd
CRITICAL 9.8

DescriptionCVE.org

Heap-based buffer overflow in Windows DHCP Server allows an unauthorized attacker to execute code over a network.

AnalysisAI

Remote code execution in the Microsoft Windows DHCP Server role allows an unauthenticated network attacker to run arbitrary code by triggering a heap-based buffer overflow (CWE-122) in the service's packet handling. The flaw carries a CVSS 9.8 with a fully remote, no-interaction, no-privilege vector and affects Windows Server 2012 through 2025 (plus the Windows 10 1607/1809 code base). At time of analysis there is no public exploit identified and the issue is not listed in CISA KEV, but the unauthenticated network-facing nature of the DHCP service makes it a high-priority patch.

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CVE-2026-56159 vulnerability details – vuln.today

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