Buffer overflow in VMware Cloud Foundation
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.
Vulnerability class: Buffer Overflow
EPSS: 0.004 (28.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.3 (Critical). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.
Affected products
- Vmware Cloud Foundation — versions 9.1.x.x, 9.0.x.x, 5.x
- Vmware Esx — versions 9.1.x.x, 9.0.x.x, 8.0
- Vmware Telco Cloud Platform — versions 5.1.x, 5.0.x
- Vmware Vsphere Foundation — versions 9.1.x.x, 9.0.x.x
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-47876?
- CVE-2026-47876 is a critical-severity vulnerability in VMware Cloud Foundation, classified under Out-of-bounds Write. CVSS score: 9.3/10. Published 2026-07-30.
- How severe is CVE-2026-47876?
- Critical severity. CVSS v3 base score is 9.3 out of 10.