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CVE-2026-56159: DHCP Server Service Remote Code Execution Vulnerability

criticalCVSS 9.8CVE-2026-56159
Heap-based buffer overflow in Windows DHCP Server allows an unauthorized attacker to execute code over a network.

CSIRTS triage

vendor: Microsoftproduct: DHCP ServerRemote code execution
What
Heap-based buffer overflow in Windows DHCP Server allows an unauthorized attacker to execute code over a network.
Who is affected
Unauthorized users targeting Windows DHCP Server deployments.
Urgency
Remediation is critical due to the high severity and potential for remote code execution.
Action
Update to the latest version of Windows DHCP Server.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
critical — CVSS 9.8
Published
2026-07-14
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56159

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-56159coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for DHCP Server Service

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

More from Microsoft Security Response Center