Vulnerability Intelligence Report
VMXNET3 out-of-bounds write vulnerability
CVE-2026-47876
VMware ESX contains an out-of-bounds write vulnerability in the VMXNET3 virtual network adapter. A malicious actor with local administrative privileges on a virtual machine with VMXNET3 virtual network adapter may exploit this issue to execute code on the host. Non VMXNET3 virtual adapters are not affected by this issue.
No Active Exploit Signals
CVSS Base Score
9.3
CRITICAL
Exploitability:2.6
Impact Score:6.1
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
—
Authentication
—
Weaponization
—
SSVC Action
—
Weaknesses (CWE)
CWE-787 ↗CWE-787 Out-of-bounds write
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| VMware | Cloud Foundation | 9.1.x.x (affected), 9.0.x.x (affected), 5.x (affected) |
| VMware | vSphere Foundation | 9.1.x.x (affected), 9.0.x.x (affected) |
| VMware | ESX | 9.1.x.x < ESXi-9.1.0.0200-25557999 (affected), 9.0.x.x < ESXi-9.0.2.0100-25595025 (affected), 8.0 < ESXi80U3k-25595708 (affected) |
| VMware | Telco Cloud Platform | 5.1.x (affected), 5.0.x (affected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
GitHub Advisory
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | VMware by Broadcom · Vendor · USA |
| Reserved | 2026-05-20T10:00:58 |
| Published | 2026-07-30T12:31:52 |
| Patch Date | 2026-07-29 |
| Last Updated | 2026-07-30T13:02:29 |
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