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Severity by source

Vendor (microsoft) PRIMARY
8.4 HIGH
AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CIRCL (temporal)
7.3 HIGH
cvss
vuln.today AI
8.4 HIGH

Local trigger with no privileges or interaction (AV:L/AC:L/PR:N/UI:N); use-after-free code execution in the service yields full C/I/A impact within an unchanged scope.

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

Primary rating from Vendor (microsoft).

CVSS VectorVendor: microsoft

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

Lifecycle Timeline

2
Analysis Generated
Jul 14, 2026 - 19:36 vuln.today
CVE Published
Jul 14, 2026 - 17:08 nvd
HIGH 8.4

DescriptionCVE.org

Use after free in Windows DHCP Client allows an unauthorized attacker to execute code locally.

AnalysisAI

Local code execution in the Windows DHCP Client service stems from a use-after-free (CWE-416) memory-corruption flaw affecting a broad range of Windows 10, Windows 11, and Windows Server releases (Server 2012 through Server 2025). Per the CVSS vector an unauthenticated attacker with local access can achieve high-impact code execution with no user interaction. There is no public exploit identified at time of analysis and it is not listed in CISA KEV; Microsoft has released a patch through the MSRC update guide.

Technical ContextAI

The Windows DHCP Client (Dhcp service / dhcpcore) is the component responsible for acquiring and renewing IP address leases and network configuration from DHCP servers. The root cause is a use-after-free (CWE-416): the code frees a heap object but retains and later dereferences a stale pointer, allowing an attacker who can influence the timing or content of that reuse to corrupt memory and hijack control flow within the service context. The affected CPE set spans client SKUs (Windows 10 1607/1809/21H2/22H2 and Windows 11 24H2/25H2/26H1) and server SKUs (Windows Server 2012, 2012 R2, 2016, 2019, 2022, 2025, including Server Core installations), indicating shared DHCP client code across the Windows platform rather than an edition-specific defect. Tags also reference denial of service, consistent with a memory-corruption bug whose most reliable observable effect is a crash of the client service.

RemediationAI

Patch available per vendor advisory - apply the Microsoft security update for CVE-2026-54128 for each affected SKU as documented at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54128, which is the primary and recommended fix. Because exact patched build numbers are not included in the input, obtain them from the MSRC update guide entry and deploy the corresponding cumulative update per Windows edition. If patching must be deferred, restrict local access to affected hosts to trusted users (this flaw requires local access per the CVSS vector) and monitor the DHCP client service; note that disabling the DHCP Client service breaks automatic IP configuration and is disruptive on DHCP-dependent networks, so it is only viable on hosts using static addressing. No vendor-published standalone workaround appears in the provided data, so prioritize the update itself.

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CVE-2026-54128 vulnerability details – vuln.today

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