CVE-2026-47876: CWE-787 Out-of-bounds write in VMware Cloud Foundation
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.
AI Analysis
Technical Summary
This vulnerability involves an out-of-bounds write in the VMXNET3 virtual network adapter component of VMware Cloud Foundation. It allows a malicious actor with local administrative access on a VM configured with VMXNET3 to potentially execute arbitrary code on the host, compromising the host system. Non-VMXNET3 adapters are not vulnerable. The issue affects specific versions of VMware Cloud Foundation, including versions 9.0.x.x, 9.1.x.x, and versions from 5.0.0 up to but not including 6.0.0. There is no vendor-provided remediation or patch information available at this time.
Potential Impact
Successful exploitation can lead to arbitrary code execution on the host from a virtual machine, compromising host confidentiality, integrity, and availability. This elevates the attacker's privileges from a VM local administrator to host-level control, posing a critical security risk.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a patch or official fix is released, limit administrative access within virtual machines using VMXNET3 adapters and consider using alternative virtual network adapters if feasible. Monitor VMware advisories closely for updates.
CVE-2026-47876: CWE-787 Out-of-bounds write in VMware Cloud Foundation
Description
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.
CVSS v3.1
Score 9.3critical
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves an out-of-bounds write in the VMXNET3 virtual network adapter component of VMware Cloud Foundation. It allows a malicious actor with local administrative access on a VM configured with VMXNET3 to potentially execute arbitrary code on the host, compromising the host system. Non-VMXNET3 adapters are not vulnerable. The issue affects specific versions of VMware Cloud Foundation, including versions 9.0.x.x, 9.1.x.x, and versions from 5.0.0 up to but not including 6.0.0. There is no vendor-provided remediation or patch information available at this time.
Potential Impact
Successful exploitation can lead to arbitrary code execution on the host from a virtual machine, compromising host confidentiality, integrity, and availability. This elevates the attacker's privileges from a VM local administrator to host-level control, posing a critical security risk.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a patch or official fix is released, limit administrative access within virtual machines using VMXNET3 adapters and consider using alternative virtual network adapters if feasible. Monitor VMware advisories closely for updates.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- vmware
- Date Reserved
- 2026-05-20T10:00:58.694Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a6b49199c2644c7f816bfc3
Added to database: 07/30/2026, 12:52:41 UTC
Last enriched: 07/30/2026, 13:09:04 UTC
Last updated: 07/30/2026, 16:14:51 UTC
Views: 30
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