CVE-2020-8871Public exploit

Guest-to-hypervisor code execution via VGA double fetch

Published Mar 23, 2020 · Updated Aug 4, 2024

Out-of-bounds write in the VGA virtual device in Parallels Desktop 15.1.0-47107 allows local users to execute code in the hypervisor. The ring3 video worker double-fetches guest-controlled height and width values from shared VGA state, then writes past its fixed screen buffer. Exploitation requires high-privileged code execution inside a guest VM and can compromise the per-VM hypervisor process on the host.

CVSS severity6.7
Medium
EPSS probability0.61%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Out-of-bounds write in the VGA virtual device in Parallels Desktop 15.1.0-47107 allows local users to execute code in the hypervisor. The ring3 video worker double-fetches guest-controlled height and width values from shared VGA state, then writes past its fixed screen buffer. Exploitation requires high-privileged code execution inside a guest VM and can compromise the per-VM hypervisor process on the host.

The record

CVE
CVE-2020-8871
Published
Mar 23, 2020
Updated
Aug 4, 2024
Vendor
Parallels
Product
Parallels Desktop
Classifications
CWE-787, T1068
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Mar 23, 2020CVE 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

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.

  1. Affected versionversion=15.1.0-47107

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Parallels · Parallels Desktopversion=15.1.0-47107

Published CVSS scores

6.7NIST NVDCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
4.6NIST NVDAV:L/AC:L/Au:N/C:P/I:P/A:P
8.2Zero Day InitiativeCVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

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)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1068Exploitation for Privilege Escalation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo