dbcve.org
Thinkcentre E93 FirmwareOperating system · Lenovo

CVE-2021-3719

MEDIUM · 6.7 CVSS v3.1 Published 2021-11-12
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
69/100
Remediation priority · Elevated
Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
A potential vulnerability in the SMI callback function that saves and restore boot script tables used for resuming from sleep state in some ThinkCentre and ThinkStation models may allow an attacker with local access and elevated privileges to execute arbitrary code.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

A vulnerability exists in the SMI (System Management Interface) callback function responsible for saving and restoring boot script tables during sleep/resume operations on certain Lenovo ThinkCentre and ThinkStation systems. This allows a local attacker with already elevated privileges to execute arbitrary code via the firmware-level attack vector.

MitigationApply the Lenovo firmware update corresponding to your model from the official Lenovo support portal; this is a BIOS/UEFI firmware vulnerability requiring system firmware remediation rather than software patching.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Thinkcentre E93 FirmwareOperating system
Affected:< fbktdfa
Thinkcentre M600 FirmwareOperating system
Affected:< m00kt65a
Thinkcentre M700 Tiny FirmwareOperating system
Affected:< fwktb9a
Thinkcentre M73 FirmwareOperating system
Affected:< fhkt86a
Thinkcentre M73p FirmwareOperating system
Affected:< fbktdfa
Thinkcentre M800 FirmwareOperating system
Affected:< fwktb9a
Thinkcentre M818z FirmwareOperating system
Affected:< m1ekt23a
Thinkcentre M83 FirmwareOperating system
Affected:< fbktdfa

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Local
Complexity
Low
Privileges
High
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify the ThinkCentre model number
    Check the system label on the chassis or run 'wmic csproduct get name' or check BIOS information via 'dmidecode -s system-product-name'
    Affected if The model is one of: E93, M600, M700 Tiny, M73, M73p, M800, M818z, or M83
  2. Determine the installed BIOS/firmware version
    Enter BIOS setup (F1 on boot) or run 'wmic bios get smbiosbiosversion' or use 'dmidecode -s bios-version'
    Affected if The firmware version is lower than the threshold for your model (E93: fbktdfa, M600: m00kt65a, M700 Tiny: fwktb9a, M73: fhkt86a, M73p: fbktdfa, M800: fwktb9a, M818z: m1ekt23a, M83: fbktdfa)
  3. Verify sleep/resume functionality is configured
    Check power management settings in Windows Power Options or Linux /sys/power/state, or verify S3 sleep state is enabled in BIOS
    Affected if Sleep/resume (S3 state) is enabled - this is required for the vulnerable SMI callback to be invoked during the sleep/resume cycle

You are affected if your ThinkCentre model matches one of the listed variants AND your current firmware version is lower than the specified threshold, regardless of sleep/resume configuration since the vulnerable code exists in firmware regardless of whether the feature is actively used.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Apply the Lenovo firmware update corresponding to your model from the official Lenovo support portal; this is a BIOS/UEFI firmware vulnerability requiring system firmware remediation rather than software patching.

Recommended fix Moderate confidence

ThinkCentre firmware version fbktdfa (E93/M73p/M83), m00kt65a (M600), fwktb9a (M700 Tiny/M800), fhkt86a (M73), or m1ekt23a (M818z) or later depending on model

  1. Identify the exact ThinkCentre model number from the affected list (E93, M600, M700 Tiny, M73, M73p, M800, M818z, or M83)
  2. Visit the official Lenovo support website at support.lenovo.com
  3. Enter the specific model number in the search or product lookup field
  4. Navigate to the Drivers & Software or BIOS/Firmware section
  5. Locate the BIOS/firmware update for the system
  6. Verify the version number meets or exceeds the fixed version for your model: E93/M73p/M83: fbktdfa or higher, M600: m00kt65a or higher, M700 Tiny/M800: fwktb9a or higher, M73: fhkt86a or higher, M818z: m1ekt23a or higher
  7. Download the firmware update package
  8. Review any pre-update requirements in the release notes (e.g., connected to AC power, battery charged)
Caveat Firmware updates carry inherent risk of system failure if interrupted; ensure stable power and do not interrupt the update process

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Thinkcentre E93 Firmware Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing4.0 h
  • Review / QA2.0 h
18.0 hours of engineering $3,200
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2021-3719 in production — separate from our analysis above.

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What this is

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What belongs here
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  • Version or environment caveats, and links to real fixes
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  • No spam, self-promotion, credentials, or personal data