CVE-2026-62823: Windows DHCP Server Remote Code Execution Vulnerability

Overview

Severity

High (CVSS 8.8)

CVSS Vector

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

Category

Remote Code Execution

Exploit Status

Not Exploited

Exploitation Likelihood

More Likely

Patch Tuesday

2026-Aug

Released

2026-08-11

Last Updated

2026-09-08

EPSS Score

0.53% (percentile: 42.7%)

Description

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

FAQ

How could an attacker exploit this vulnerability? An unauthenticated attacker could exploit this vulnerability by sending a specially crafted packet to an affected service over the network. Successful exploitation could allow the attacker to execute code on the target system. No authentication or user interaction is required.

Affected Products (12)

Windows

• Windows Server 2019
• Windows Server 2019 (Server Core installation)
• Windows Server 2022
• Windows Server 2022 (Server Core installation)
• Windows Server 2025 (Server Core installation)
• Windows Server 2025
• Windows Server 2016
• Windows Server 2016 (Server Core installation)

ESU

• Windows Server 2012
• Windows Server 2012 (Server Core installation)
• Windows Server 2012 R2
• Windows Server 2012 R2 (Server Core installation)

Security Updates (8)

• 5120238
• 5120242
• 5120229
• 5120233
• 5120228
• 5120418
• 5120386
• 5120385

Acknowledgments

<a href="https://x.com/marcosd4h">Marcos Oviedo with Deep Extract Harness</a>, Linzishan & Anemone & Zhiniang Peng (HUST)

Revision History

• 2026-08-11: Information published.
• 2026-08-31: Updated an acknowledgement. This is an informational change only.
• 2026-09-08: Updated software table to remove clients versions because this vulnerability only impacts Windows Servers. This is an informational change only.