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Windows DHCP Server CVE-2026-62814

| EUVDEUVD-2026-56674 MEDIUM
Out-of-bounds Read (CWE-125)
2026-08-11 secure@microsoft.com GHSA-248v-fmcv-3gc5
Buffer Overflow Information Disclosure Microsoft Windows 10 1607 Windows 10 1809 Windows Server 2012 Windows Server 2016 Windows Server 2019 Windows Server 2022 Windows Server 2025
6.5
CVSS 3.1 · Vendor: microsoft
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Severity by source

Vendor (microsoft) PRIMARY
6.5 MEDIUM
AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
vuln.today AI
6.5 MEDIUM

DHCP is inherently pre-authentication (PR:N) and adjacent-only (AV:A); out-of-bounds read causes confidentiality loss only, with no write or availability impact.

3.1 AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
4.0 AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (microsoft).

CVSS VectorVendor: microsoft

Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

Lifecycle Timeline

3
Analysis Generated
Aug 11, 2026 - 22:35 vuln.today
Patch available
Aug 11, 2026 - 18:19 EUVD
CVE Published
Aug 11, 2026 - 17:18 cve.org
MEDIUM 6.5

DescriptionCVE.org

Integer underflow (wrap or wraparound) in Windows DHCP Server allows an unauthorized attacker to disclose information over an adjacent network.

AnalysisAI

Integer underflow in the Windows DHCP Server service exposes adjacent-network unauthenticated attackers to high-confidentiality memory disclosure across a broad range of Windows Server releases from 2012 through 2025, plus Windows 10 1607 and 1809. The root cause (CWE-125 out-of-bounds read triggered by arithmetic underflow) allows a crafted DHCP packet to cause the server to read and return memory beyond the intended buffer boundary. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation The Windows DHCP Server role (not installed by default on all SKUs) must be actively running on the target system. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment CVSS 6.5 (Medium) with AV:A accurately captures the bounded blast radius: the adjacent-network constraint (AV:A) means the attacker must be on the same Layer 2 segment or reachable via a DHCP relay, eliminating direct internet exploitation. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Apply the Microsoft security update referenced at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62814 to bring affected systems to the fixed builds: Windows Server 2012 to 6.2.9200.26279 or later, Windows Server 2012 R2 to 6.3.9600.23337 or later, Windows Server 2016 to 10.0.14393.9418 or later, Windows Server 2019 to 10.0.17763.9115 or later, Windows Server 2022 to 10.0.20348.5499 or later, and Windows Server 2025 to 10.0.26100.33296 or later. … Detailed patch versions, workarounds, and compensating controls in full report.
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Same weakness CWE-125 – Out-of-bounds Read

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CVE-2026-62814 vulnerability details – vuln.today
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