CVE-2023-20867

A fully compromised ESXi host can force VMware Tools to fail to authenticate host-to-guest operations, impacting the confidentiality and integrity of the guest virtual machine.

Exploited in the wild: Yesadded 2023-06-23 · due 2023-07-14. An observation, not a forecast.
EPSS · 30-day forecast: 14%Chance of exploitation in the next 30 days, 96th percentile of all CVEs. A forecast; KEV outranks it.
CVSS · NVD · LOW: 3.9CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N
Internet exposure: not stated by sourcesNo exposure census on this CVE's dispatches.

Exploits

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On the wire

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Cited as exploited by

UNC3886
1. “As investigations into UNC3886 activity continued in 2023, Mandiant discovered that the attacker utilized a zero-day vulnerability, CVE-2023-20867, to execute commands and transfer files to and from guest VMs from a compromised ESXi host without the need for guest credentials.”
  cited as exploiting · source: cloud.google.com ↗ · 2026-10-17
2. “UNC3886 has exploited zero-day vulnerability CVE-2023-20867 to enable execution of privileged commands across Windows, Linux, and PhotonOS (vCenter) guest VMs.”
  cited as exploiting · source: attack.mitre.org ↗ · 2026-10-17

Each actor is cited by the quoted source, linked under the quote. A citation is that source's claim, not our confirmation.

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