CVE-2021-33060

Local privilege escalation via BIOS out-of-bounds write

Published Aug 18, 2022 · Updated May 5, 2025

An out-of-bounds write in 3rd Generation Intel Xeon Scalable Processor BIOS firmware allows local users to escalate privileges. Intel identifies the locus only as BIOS firmware and has not disclosed the affected routine, malformed input, or boundary-check failure. Exploitation requires authenticated local access and can compromise confidentiality, integrity, and availability through elevated privileges.

CVSS severity7.8
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

An out-of-bounds write in 3rd Generation Intel Xeon Scalable Processor BIOS firmware allows local users to escalate privileges. Intel identifies the locus only as BIOS firmware and has not disclosed the affected routine, malformed input, or boundary-check failure. Exploitation requires authenticated local access and can compromise confidentiality, integrity, and availability through elevated privileges.

The record

CVE
CVE-2021-33060
Published
Aug 18, 2022
Updated
May 5, 2025
Vendor
Topcon Positioning Systems, Inc.
Product
3rd Gen Intel Xeon Scalable Processors
Classifications
CWE-787, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 18, 2022CVE publishedPublication date reported by the CVE source.
  2. May 5, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=See references

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Topcon Positioning Systems, Inc. · 3rd Gen Intel Xeon Scalable Processorsversion=See references

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8Intel CorporationCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
7.8CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/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.

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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

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

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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