CVE-2020-8336

Firmware rollback through missing CSME anti-rollback protection

Published Jun 9, 2020 · Updated Sep 16, 2024

Missing anti-rollback protection in Lenovo ThinkPad BIOS allows physically proximate attackers to restore older CSME firmware in flash. Lenovo identifies the locus as Intel CSME anti-rollback protection in system flash but does not disclose the failed check or code path. Physical access is required; the disclosed consequence is restoration of older CSME code, and Lenovo does not detail any subsequent compromise.

CVSS severity6.4
Medium
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing anti-rollback protection in Lenovo ThinkPad BIOS allows physically proximate attackers to restore older CSME firmware in flash. Lenovo identifies the locus as Intel CSME anti-rollback protection in system flash but does not disclose the failed check or code path. Physical access is required; the disclosed consequence is restoration of older CSME code, and Lenovo does not detail any subsequent compromise.

The record

CVE
CVE-2020-8336
Published
Jun 9, 2020
Updated
Sep 16, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1601.002
Attack vector
physical
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 9, 2020CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorphysical
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.6NIST NVDAV:L/AC:L/Au:N/C:P/I:P/A:P
6.8NIST NVDCVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
6.4Lenovo Group Ltd.CVSS:3.1/AV:P/AC:H/PR:N/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)
Vectorphysical
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1601.002Downgrade System Image

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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