Guest-to-host code execution via VMXNET3 overwrite
Published Jul 30, 2026 · Updated Jul 30, 2026
Out-of-bounds write in the VMXNET3 adapter in VMware ESX allows guest OS users with administrative access to execute code on the host. Broadcom has not published the exact VMXNET3 field, handler, or missing bounds check that permits guest-controlled data to overwrite memory. Exploitation requires an administratively controlled guest configured with VMXNET3; other virtual adapters are unaffected.
Summary
What happened
Out-of-bounds write in the VMXNET3 adapter in VMware ESX allows guest OS users with administrative access to execute code on the host. Broadcom has not published the exact VMXNET3 field, handler, or missing bounds check that permits guest-controlled data to overwrite memory. Exploitation requires an administratively controlled guest configured with VMXNET3; other virtual adapters are unaffected.
The record
- CVE
- CVE-2026-47876
- Published
- Jul 30, 2026
- Updated
- Jul 30, 2026
- Vendor
- VMware
- Product
- VMware Telco Cloud Platform
- Classifications
- CWE-787, T1068
- Attack vector
- local
- Privileges
- admin
Timeline
How it unfolded
- May 16, 2026Exploitation reportedPwn2Own Berlin 2026 demonstration
- Jul 30, 2026CVE publishedPublication date reported by the CVE source.
- Jul 30, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=5.0.x
- Affected versionversion=5.1.x
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Reported exploitation
- Pwn2Own Berlin 2026 demonstrationreported exploitation
Technologies
Your stack
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Your stack
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