CVE-2026-49181: Windows DHCP Client Elevation of Privilege Vulnerability

Published Jul 14, 2026
·
Updated

Integer underflow (wrap or wraparound) in Windows DHCP Client allows an unauthorized attacker to elevate privileges over a network.

Other sources

Windows DHCP Client Elevation of Privilege Vulnerability

— Microsoft

Affected Software

25 affected componentsFixes available
Microsoft Windows Server 2025<10.0.26100.33158
10.0.26100.33158
Microsoft Windows Server 2022<10.0.20348.5386
10.0.20348.5386
Microsoft Windows 10=1607
10.0.14393.9339
Microsoft Windows Server 2019<10.0.17763.9020
10.0.17763.9020
Microsoft Windows Server 2012 R2<6.3.9600.23291
6.3.9600.23291
Microsoft Windows Server 2025<10.0.26100.33158
10.0.26100.33158
Microsoft Windows Server 2016<10.0.14393.9339
10.0.14393.9339
Microsoft Windows 10=1809
10.0.17763.9020
Microsoft Windows 10=1809
10.0.17763.9020
Microsoft Windows Server 2012 R2<6.3.9600.23291
6.3.9600.23291
Microsoft Windows 10=1607
10.0.14393.9339
Microsoft Windows Server 2019<10.0.17763.9020
10.0.17763.9020
Microsoft Windows Server 2016<10.0.14393.9339
10.0.14393.9339
Microsoft Windows Server 2012<6.2.9200.26226
6.2.9200.26226
Microsoft Windows Server 2012<6.2.9200.26226
6.2.9200.26226
Microsoft Windows 10 1607<10.0.14393.9339
Microsoft Windows 10 1607<10.0.14393.9339
Microsoft Windows 10 1809<10.0.17763.9020
Microsoft Windows 10 1809<10.0.17763.9020
Microsoft Windows Server 2012
Microsoft Windows Server 2012=r2
Microsoft Windows Server 2016<10.0.14393.9339
Microsoft Windows Server 2019<10.0.17763.9020
Microsoft Windows Server 2022<10.0.20348.5386
Microsoft Windows Server 2025<10.0.26100.33158

Remediation

Patch Available

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-49181

Event History

Jul 14, 2026
CVE Published
via Microsoft·02:00 PM
Data Sourced
via Microsoft·02:00 PM
DescriptionSeverityWeakness
Data Sourced
via Microsoft·02:00 PM
Affected Software
Updated
via Microsoft·02:00 PM
Description
CVE Published
via MITRE·05:05 PM
Data Sourced
via MITRE·05:05 PM
DescriptionSeverity
Data Sourced
via NVD·05:16 PM
RemedyDescriptionSeverityWeaknessAffected Software
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Frequently Asked Questions

1

What is CVE-2026-49181?

CVE-2026-49181 is a high-severity vulnerability in the Windows DHCP Client that allows unauthorized privilege escalation through an integer underflow.

2

What is the severity of CVE-2026-49181?

CVE-2026-49181 has a severity rating of 7.5 which classifies it as high risk.

3

How do I fix CVE-2026-49181?

To mitigate CVE-2026-49181, you should apply the latest security updates provided by Microsoft for your affected Windows version.

4

Who is affected by CVE-2026-49181?

CVE-2026-49181 affects multiple versions of Microsoft Windows including Windows 10, Server 2025, Server 2019, Server 2012 R2, Server 2016, Server 2012, and Server 2022.

5

What are the potential impacts of CVE-2026-49181?

The potential impact of CVE-2026-49181 includes unauthorized privilege escalation for attackers over a network.

Company

Resources

Contact

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