CVE-2021-2126

High-privilege local data modification

Published Jan 20, 2021 · Updated Sep 26, 2024

Oracle VM VirtualBox before 6.1.18 contains a vulnerability allowing local users with high privileges to modify critical data via local execution. Oracle has not publicly disclosed the specific component locus or flawed operation behind CVE-2021-2126. Exploitation requires a high-privilege logon to the VirtualBox host and can affect Oracle VM VirtualBox accessible data, with integrity impact reported and no confidentiality or availability impact stated.

CVSS severity6.0
Medium
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Oracle VM VirtualBox before 6.1.18 contains a vulnerability allowing local users with high privileges to modify critical data via local execution. Oracle has not publicly disclosed the specific component locus or flawed operation behind CVE-2021-2126. Exploitation requires a high-privilege logon to the VirtualBox host and can affect Oracle VM VirtualBox accessible data, with integrity impact reported and no confidentiality or availability impact stated.

The record

CVE
CVE-2021-2126
Published
Jan 20, 2021
Updated
Sep 26, 2024
Vendor
Oracle Corporation
Product
Oracle VM VirtualBox
Classifications
Unavailable
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Jan 20, 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 <6.1.18

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Oracle Corporation · Oracle VM VirtualBoxversion=unspecified <6.1.18

Published CVSS scores

6.0Oracle CorporationCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:H/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.

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 exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

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

Technologies

Your stack

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Your stack

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