CVE-2026-47876

VMXNET3 out-of-bounds write vulnerability

Critical9.3EPSS 0.19%

Published: 30 Jul 2026
Updated: 30 Jul 2026
Reserved: 20 May 2026
Assigned by: vmware

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.

Scores

CVSS scores of CVE-2026-47876, by who scored it
Scored by	CVSS	Score	Vector
vmwareCNA (assigner)	3.1	Critical9.3	CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
NVDNVD · Awaiting Analysis	3.1	Critical9.3	CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

EPSS (exploitation in 30 days): 0.19% · top 91% of all CVEs (3 Nov 2026)
CISA SSVC: Exploitation: none · Automatable: no · Technical impact: total

The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.3.

Weakness

CWE-787 Out-of-bounds write (opens in a new tab)All about CWE-787 and its CVEs

Affected products

VMware · Cloud Foundation
- affected 9.1.x.x
- affected 9.0.x.x
- affected 5.x
VMware · vSphere Foundation
- affected 9.1.x.x
- affected 9.0.x.x
VMware · ESX
- affected 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
VMware · Telco Cloud Platform
- affected 5.1.x
- affected 5.0.x

References (1)

https://support.broadcom.com/web/ecx/support-content-notification/-/external/content/SecurityAdvisories/0/38017 (opens in a new tab)

Sources

The same CVE in the primary databases and aggregators, to check against.

Badge for a README or a ticket

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Record last updated 30 Jul 2026, 13:02 UTC.