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CVE-2026-62823

Windows DHCP Server Remote Code Execution Vulnerability

Published: Aug 11, 2026Updated: Aug 16, 2026 Sources: CVE List NVDCWE-122
8.8HIGH
NVD MITRE
EPSS Score
0.5%
Top 56.6%
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

This Windows DHCP Server flaw could let an attacker remotely take over a machine on the network—if you run DHCP on Windows Server (or Windows 10) and it’s reachable from other networks, you should patch right away.

Executive summary

CVE-2026-62823 is a Windows DHCP Server remote code execution vulnerability (CWE-122, heap-based buffer overflow) that can be triggered by a remote, unauthorized attacker interacting with DHCP server behavior over the network.

If affected, business impact
Full server takeoverService disruption for networkingPotential theft of network credentialsWider network compromise risk

What to do now

  1. Check whether you are running Windows DHCP Server (or any Windows device acting as a DHCP server) in the affected product list.
  2. Identify your exact OS version (e.g., Windows Server 2019 build, Windows 10 build) and compare it to the fixed version numbers below.
  3. Upgrade/patch immediately to one of the fixed versions:
    • Windows 10: fixed in 10.0.14393.9418 or 10.0.17763.9121 (and 10.0.17763.9115 for the relevant servicing branch)
    • Windows Server 2012: fixed in 6.2.9200.26280
    • Windows Server 2012 R2: fixed in 6.3.9600.23338
    • Windows Server 2016: fixed in 10.0.14393.9418
    • Windows Server 2019: fixed in 10.0.17763.9121 (and 10.0.17763.9115 for the relevant servicing branch)
    • Windows Server 2022: fixed in 10.0.20348.5499 (and 10.0.20348.5440 for the relevant servicing branch)
    • Windows Server 2025: fixed in 10.0.26100.33296 (and 10.0.26100.33222 for the relevant servicing branch)
  4. If patching must be delayed, restrict who can reach the DHCP server from other networks (network segmentation/firewall rules) until the fixed update is installed.
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-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 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
Windows Server 2012 R2 (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-2026-62823?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

1 technique
Privilege Escalation
View detailed technique mapping

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62823
msrc.microsoft.com
News mentions
4

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