CVE-2026-62742 — Windows DHCP Server Information Disclosure Vulnerability

Executive Summary

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

Overview

6.5

CVSS MEDIUM

Important

MS Severity

Not Exploited

MS Exploit Status

Less Likely

MS Exploit Likelihood

Category Information Disclosure

Released Aug 11 2026

Last Updated Aug 11 2026

Publicly Disclosed No

CISA KEV Not Listed

Known Exploits None Known

EPSS Score 0.00491 — 0.39895 percentile

NVD CVSS 6.5 MEDIUM — matches MSRC

CVSS Vector

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

ATTACK VECTOR

Adjacent_network

ATTACK COMPLEXITY

Low

PRIVILEGES REQUIRED

None

USER INTERACTION

None

SCOPE

Unchanged

CONFIDENTIALITY

High

INTEGRITY

None

AVAILABILITY

None

EXPLOIT CODE MATURITY

Unproven

REMEDIATION LEVEL

Official Fix

REPORT CONFIDENCE

Confirmed

Temporal Score: 5.7

EPSS Score

0.00491

probability of exploitation in the next 30 days

0.39895 percentile - updated 2026-08-14

View on FIRST.org

Affected Products

12 affected products

Product	KB Article	Severity	Impact	Restart Required
Windows 10 Version 1607 for 32-bit Systems	`5120418 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1607 for x64-based Systems	`5120418 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1809 for 32-bit Systems	`5120238 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1809 for x64-based Systems	`5120238 (Security Update)`	Important	Information Disclosure	Yes
Windows Server 2012	`5120386 (Monthly Rollup)`	Important	Information Disclosure	Yes
Windows Server 2012 (Server Core installation)	`5120386 (Monthly Rollup)`	Important	Information Disclosure	Yes
Windows Server 2012 R2	`5120385 (Monthly Rollup)`	Important	Information Disclosure	Yes
Windows Server 2012 R2 (Server Core installation)	`5120385 (Monthly Rollup)`	Important	Information Disclosure	Yes
Windows Server 2016	`5120418 (Security Update)`	Important	Information Disclosure	Yes
Windows Server 2016 (Server Core installation)	`5120418 (Security Update)`	Important	Information Disclosure	Yes
Windows Server 2019	`5120238 (Security Update)`	Important	Information Disclosure	Yes
Windows Server 2019 (Server Core installation)	`5120238 (Security Update)`	Important	Information Disclosure	Yes

Patches

4 patches

Article	Type	Restart
`5120418`	Security Update	Yes
`5120238`	Security Update	Yes
`5120386`	Monthly Rollup	Yes
`5120385`	Monthly Rollup	Yes

Known Exploits

No known exploits have been linked for this CVE yet. When available, exploit references will be sourced from public repositories and may be unverified, incomplete, or non-functional. Always review code carefully before use in any environment.

Acknowledgments

Howard McGreehan with MSRC V&M

References

MSRC Advisory MITRE NVD