CVE-2021-2291

Sensitive-data disclosure via VGA out-of-bounds read

Published Apr 22, 2021 · Updated Sep 26, 2024

Out-of-bounds read in the VGA component of Oracle VM VirtualBox before 6.1.20 allows local users to disclose sensitive host data. The VGA component fails to validate user-supplied data before reading an allocated buffer, allowing a read past its end. Exploitation requires low-privileged code execution on the host and yields confidentiality loss; code execution requires chaining another flaw.

CVSS severity4.7
Medium
EPSS probability0.76%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in the VGA component of Oracle VM VirtualBox before 6.1.20 allows local users to disclose sensitive host data. The VGA component fails to validate user-supplied data before reading an allocated buffer, allowing a read past its end. Exploitation requires low-privileged code execution on the host and yields confidentiality loss; code execution requires chaining another flaw.

The record

CVE
CVE-2021-2291
Published
Apr 22, 2021
Updated
Sep 26, 2024
Vendor
Oracle Corporation
Product
Oracle VM VirtualBox
Classifications
T1005
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 22, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 26, 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=unspecified <6.1.20

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Oracle Corporation · Oracle VM VirtualBoxversion=unspecified <6.1.20

Published CVSS scores

1.9NIST NVDAV:L/AC:M/Au:N/C:P/I:N/A:N
4.7OracleCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

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.

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1005Data from Local System

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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