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CVE-2026-50370

DHCP Server Service Remote Code Execution Vulnerability

Published: Jul 14, 2026Updated: Jul 20, 2026 Sources: CVE List NVDCWE-20
8.8HIGH
NVD MITRE
EPSS Score
0.5%
Top 58.9%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

Description

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

In plain language

AI Act now

CVE-2026-50370 is a Windows DHCP Server security flaw that can let a remote attacker run code from the network; if your small business runs DHCP Server on affected Windows versions, you should treat this as urgent and patch now.

Executive summary

CVE-2026-50370 is a Windows DHCP Server Remote Code Execution issue caused by a memory-safety weakness (heap buffer overflow) that can be triggered by an attacker from an adjacent network segment against the DHCP Server service.

If affected, business impact
Full device compromiseNetwork-wide disruptionMalware installation riskService outage

What to do now

  1. Check whether you run the Windows DHCP Server role/service on any of these systems: Windows 10, Windows Server 2012/2012 R2, 2016, 2019, 2022, or 2025.
  2. If DHCP Server is in use on affected versions, update immediately to the fixed versions listed by Microsoft for CVE-2026-50370.
  3. Verify updates completed and reboot if your organization’s update policy requires it.
  4. If you can’t patch right away, restrict network access to the DHCP Server so only the intended subnets/clients can reach it, and document the temporary risk acceptance until patching is complete.
Patch / advisory Usually a quick update

CVSS Vector Breakdown

AV:AAC:LPR:NUI:NS:UC:HI:HA:H
Exploitability
AV:AAttack Vector
Adjacent
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-20CWE-122

Affected Products

Microsoft
commercial·US
Windows 10 Version 1607On-premOS
Operating Systems / windows
Windows Server 2012 (Server Core installation)On-premOS
Operating Systems / windows
Windows Server 2012 R2 (Server Core installation)On-premOS
Operating Systems / windows
Windows Server 2016 (Server Core installation)On-premOS
Operating Systems / windows
Windows Server 2019 (Server Core installation)On-premOS
Operating Systems / windows
Windows Server 2022On-premOS
Operating Systems / windows
Windows Server 2025 (Server Core installation)On-premOS
Operating Systems / windows
and 13 more affected products View all →

Exploitability

Official Patch Available
Is your org exposed to CVE-2026-50370?We can run the check for you — a free external exposure review, no install. Check my exposure

Attack Graph

Products CVE Techniques Tactics

Click technique nodes for MITRE ATT&CK details · drag to pan · Ctrl/⌘ + scroll to zoom, or go fullscreen.

MITRE ATT&CK

2 techniques
Initial Access
Privilege Escalation
View detailed technique mapping

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50370
msrc.microsoft.com
News mentions
5

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