CVE-2020-7467

Guest escape via untrapped AMD virtualization instructions

Published Mar 26, 2021 · Updated Aug 4, 2024

Guest escape in bhyve on vulnerable FreeBSD releases allows guest OS users with kernel access to take full control of an AMD host. The SVM implementation fails to trap AMD virtualization instructions that accept host physical addresses, so guest operands bypass nested page table translation and can write constrained arbitrary host memory. Exploitation requires kernel-mode execution inside a bhyve guest on an AMD CPU; successful use grants full control of the host.

CVSS severity7.6
High
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Guest escape in bhyve on vulnerable FreeBSD releases allows guest OS users with kernel access to take full control of an AMD host. The SVM implementation fails to trap AMD virtualization instructions that accept host physical addresses, so guest operands bypass nested page table translation and can write constrained arbitrary host memory. Exploitation requires kernel-mode execution inside a bhyve guest on an AMD CPU; successful use grants full control of the host.

The record

CVE
CVE-2020-7467
Published
Mar 26, 2021
Updated
Aug 4, 2024
Vendor
The FreeBSD Project
Product
FreeBSD
Classifications
CWE-269, T1068
Attack vector
physical
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 26, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=FreeBSD 12.1-RELEASE before p10, 11.4-RELEASE before p4, 11.3-RELEASE before p14

What conditions does exploitation require?

Attack vectorphysical
Required privilegesunauthenticated

What is affected?

The FreeBSD Project · FreeBSDversion=FreeBSD 12.1-RELEASE before p10, 11.4-RELEASE before p4, 11.3-RELEASE before p14

Published CVSS scores

7.6NIST NVDCVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
7.2NIST NVDAV:L/AC:L/Au:N/C:C/I:C/A:C

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorphysical
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-269Improper Privilege Management
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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