Description
Out-of-bounds read in Windows DHCP Server allows an authorized attacker to disclose information locally.
Published: 2026-06-09
Score: 5.5 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Impact

The vulnerability is an out‑of‑bounds read in the Windows DHCP server component. An attacker who already has local, authorized access could read memory beyond intended bounds, potentially exposing sensitive information. The CVE description notes information disclosure but does not specify the exact data; it is inferred that configuration settings or credentials might be at risk, though this is not stated explicitly.

Affected Systems

Affected are many Windows client and server workloads, including Windows 10 from version 1607 through 22H2, Windows 11 from 23H2 through 26H1, and a range of Windows Server releases from 2012 to 2025. The vulnerability applies to both x86 and x64 architectures, and for Windows 10 and 11 ARM64 builds. The product families listed include both client and server editions, and the description references the DHCP server service.

Risk and Exploitability

The CVSS score is 5.5, indicating moderate severity. The EPSS score is not available and the vulnerability is not listed in CISA KEV. The attack vector is local and requires authorized access; an attacker would need physical or privileged network presence to exploit. Once exploitation succeeds, the attacker could read memory data, but the exploit does not provide higher privileges or persistence. Given the moderate score and lack of widespread exploitation data, organizations should treat the issue as a medium risk that warrants patching as soon as updates become available.

Generated by OpenCVE AI on June 9, 2026 at 21:22 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Apply the security update for CVE‑2026‑45634 via Windows Update or Microsoft Update Catalog, addressing the out‑of‑bounds read in the DHCP server.
  • Restrict DHCP server operation to trusted administrative accounts and enable least‑privilege access controls so that only authorized users can manipulate DHCP configurations and client assignments.
  • Enable audit logging for DHCP service events and monitor for anomalous activity, which can provide early detection of exploitation attempts.

Generated by OpenCVE AI on June 9, 2026 at 21:22 UTC.

Tracking

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Advisories

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History

Wed, 10 Jun 2026 11:30:00 +0000

Type Values Removed Values Added
First Time appeared Microsoft windows 10 21h2
Microsoft windows 10 22h2
Microsoft windows 11 23h2
Microsoft windows 11 24h2
Microsoft windows 11 25h2
Microsoft windows 11 26h1
Microsoft windows Server 2012 (server Core Installation)
Microsoft windows Server 2012 R2
Microsoft windows Server 2012 R2 (server Core Installation)
Microsoft windows Server 2016 (server Core Installation)
Microsoft windows Server 2019 (server Core Installation)
Microsoft windows Server 2025 (server Core Installation)
Vendors & Products Microsoft windows 10 21h2
Microsoft windows 10 22h2
Microsoft windows 11 23h2
Microsoft windows 11 24h2
Microsoft windows 11 25h2
Microsoft windows 11 26h1
Microsoft windows Server 2012 (server Core Installation)
Microsoft windows Server 2012 R2
Microsoft windows Server 2012 R2 (server Core Installation)
Microsoft windows Server 2016 (server Core Installation)
Microsoft windows Server 2019 (server Core Installation)
Microsoft windows Server 2025 (server Core Installation)

Tue, 09 Jun 2026 17:15:00 +0000

Type Values Removed Values Added
Description Out-of-bounds read in Windows DHCP Server allows an authorized attacker to disclose information locally.
Title Windows DHCP Client Information Disclosure Vulnerability
First Time appeared Microsoft
Microsoft windows 10 1607
Microsoft windows 10 1809
Microsoft windows 10 21h2
Microsoft windows 10 22h2
Microsoft windows 11 23h2
Microsoft windows 11 24h2
Microsoft windows 11 25h2
Microsoft windows 11 26h1
Microsoft windows Server 2012
Microsoft windows Server 2012 R2
Microsoft windows Server 2016
Microsoft windows Server 2019
Microsoft windows Server 2022
Microsoft windows Server 2025
Weaknesses CWE-125
CPEs cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_10_21H2:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_10_22H2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_11_23H2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_23H2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_11_24H2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_25H2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_26H1:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2012:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2012_R2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*
Vendors & Products Microsoft
Microsoft windows 10 1607
Microsoft windows 10 1809
Microsoft windows 10 21h2
Microsoft windows 10 22h2
Microsoft windows 11 23h2
Microsoft windows 11 24h2
Microsoft windows 11 25h2
Microsoft windows 11 26h1
Microsoft windows Server 2012
Microsoft windows Server 2012 R2
Microsoft windows Server 2016
Microsoft windows Server 2019
Microsoft windows Server 2022
Microsoft windows Server 2025
References
Metrics cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C'}


Subscriptions

Microsoft Windows 10 1607 Windows 10 1809 Windows 10 21h2 Windows 10 21h2 Windows 10 22h2 Windows 10 22h2 Windows 11 23h2 Windows 11 23h2 Windows 11 24h2 Windows 11 24h2 Windows 11 25h2 Windows 11 25h2 Windows 11 26h1 Windows 11 26h1 Windows Server 2012 Windows Server 2012 (server Core Installation) Windows Server 2012 R2 Windows Server 2012 R2 Windows Server 2012 R2 (server Core Installation) Windows Server 2016 Windows Server 2016 (server Core Installation) Windows Server 2019 Windows Server 2019 (server Core Installation) Windows Server 2022 Windows Server 2025 Windows Server 2025 (server Core Installation)
cve-icon MITRE

Status: PUBLISHED

Assigner: microsoft

Published:

Updated: 2026-06-09T21:50:07.192Z

Reserved: 2026-05-12T20:33:35.155Z

Link: CVE-2026-45634

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-06-09T17:17:29.920

Modified: 2026-06-09T19:32:51.440

Link: CVE-2026-45634

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-06-10T11:15:05Z

Weaknesses