CVE-2026-47876: VMXNET3 out-of-bounds write vulnerability
Advisory generated from the CVE record, CISA, Exploit Observer and VEDAS: what it is, whether it is exploited, who is affected, and how to fix and detect it.
Generated by VEDAS. Scores as of 2026-11-08 00:03 UTC. Rebuilt every few hours from cve-scores, CISA KEV and vedas-signatures. How this works and its limits.
What it is
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.
Description quoted from the CVE record (assigned by vmware, published 2026-07-30).
Weakness: CWE-787 Out-of-bounds write
How it can be exploited
Exploitable with local access with low attack complexity needing no privileges and no user interaction. Impact: confidentiality high, integrity high, availability high. CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CISA assessment (SSVC): CISA has no evidence of exploitation. Automatable: no. Technical impact: total.
Public exploit evidence (Exploit Observer)
Exploit Observer found 1 research write-up naming this CVE.
See all 5 references on Exploit Observer
Live scores
- EPSS
- 0.002
low predicted chance of attack - VEDAS
- 0.979
strong exploit evidence - On CISA KEV
- Not listed
- Detection rule
- No public rule yet
Who is affected
| Product | Affected | Not affected |
|---|---|---|
| VMware Cloud Foundation | version 9.1.x.x version 9.0.x.x version 5.x | Not stated |
| VMware vSphere Foundation | version 9.1.x.x version 9.0.x.x | Not stated |
| VMware ESX | from 9.1.x.x before ESXi-9.1.0.0200-25557999 from 9.0.x.x before ESXi-9.0.2.0100-25595025 from 8.0 before ESXi80U3k-25595708 | Not stated |
| VMware Telco Cloud Platform | version 5.1.x version 5.0.x | Not stated |
Version ranges exactly as the CVE record states them. “Before X” means X is the first fixed version.
How to fix it
Fixed versions stated in the CVE record: ESXi-9.1.0.0200-25557999, ESXi-9.0.2.0100-25595025, ESXi80U3k-25595708.
How to detect it
There is no open VEDAS detection rule for this bug yet. It is listed on the detection gaps page if CISA has confirmed attacks.
Advisories on this CVE
- VMware vCenter CVE-2026-59310 and CVE-2026-59309: syslog path traversal to root RCE and LDAP login bypass, exploited (full advisory)
References
Other references
Other databases
Where this comes from
This advisory is generated automatically by VEDAS from: CVE.org record, cve-scores (EPSS and VEDAS), Exploit Observer. Text in quotes is reproduced from the source; everything else is a fixed template filled with source fields. Nothing here is written by a language model. Check the vendor advisory before acting, and read how VEDAS and Exploit Observer work, and their limits.
Supporting partners
