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Ethernet Controller I225 It FirmwareOperating system · Intel

CVE-2021-33142

MEDIUM · 6.0 CVSS v3.1 Published 2024-02-23
Fix available
A fix is available. Upgrade to 1.87 / 29.0.1 or later.
See remediation →
62/100
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
Improper input validation in some Intel(R) Ethernet Adapters and Intel(R) Ethernet Controller I225 Manageability firmware may allow a privileged user to potentially enable denial of service via local access.

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 · moderate confidence

Improper input validation in Intel Ethernet Adapters and Intel Ethernet Controller I225 Manageability firmware allows a privileged local user to potentially cause a denial of service via specially crafted input.

MitigationApply the latest Intel firmware update for affected Ethernet adapters and controllers when available; restrict physical and local access to trusted privileged users only.

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
Ethernet Controller I225 It FirmwareOperating system
Affected:< 1.87
Ethernet Controller I225 Lm FirmwareOperating system
Affected:< 1.87
Ethernet Controller I225 V FirmwareOperating system
Affected:< 1.87
Ethernet Adapter Complete DriverApplication
Affected:< 29.0.1

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
Changed
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/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 Intel I225 Ethernet hardware present
    Run 'lspci | grep -i ethernet' or check Device Manager on Windows to list Ethernet controllers. Look for Intel Ethernet Controller I225 variants (IT, LM, or V variants).
    Affected if No Intel I225 hardware is found, then this CVE does not apply to the system.
  2. Check I225 firmware version on Linux
    Run 'ethtool -i <interface>' for each I225 interface (e.g., eth0). Look for the 'firmware-version' field.
    Affected if Firmware version is present and less than 1.87 (e.g., 1.86, 1.80, etc.). If version shows 1.87 or higher, the system is not affected by the firmware aspect of this CVE.
  3. Check I225 firmware version on Windows
    Open Device Manager, expand Network adapters, right-click the Intel I225 device, go to Properties > Driver tab, or use 'driverquery' / 'wmic' to query driver details. Check firmware/firmware version if displayed in adapter properties.
    Affected if Displayed firmware version is below 1.87.
  4. Check Intel Ethernet Adapter driver version
    On Linux: run 'ethtool -i <interface>' and note the 'driver' and 'version' fields. On Windows: open Device Manager, right-click Intel Ethernet adapter, check Properties > Driver tab for driver version.
    Affected if Driver version is present and less than 29.0.1. Version 29.0.1 or higher indicates the fix is included.

A system is affected if it contains an Intel Ethernet Controller I225 with firmware below 1.87 OR the Intel Ethernet Adapter driver is below version 29.0.1.

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
Upgrade available Upgrade to 1.87 / 29.0.1 or later
Fixed in 1.8729.0.1
Interim mitigation

Apply the latest Intel firmware update for affected Ethernet adapters and controllers when available; restrict physical and local access to trusted privileged users only.

Recommended fix High confidence

Firmware version 1.87 or later; Driver version 29.0.1 or later

  1. Identify the specific Intel Ethernet product model (I225 IT, I225 LM, or I225 V) in the affected system
  2. Check current firmware version on the Ethernet Controller I225 (can be done via Intel® Ethernet Flash Firmware Utility or system BIOS/UEFI
  3. Check current driver version via Device Manager or 'ethtool -i' command on Linux
  4. Download the latest Intel Ethernet Adapter Complete Driver Pack version 29.0.1 or later from intel.com/support
  5. Download the latest I225 firmware version 1.87 or later from intel.com/support (specific to your model: IT, LM, or V)
  6. Install the driver update (29.0.1 or later) following Intel's installation instructions
  7. Apply the firmware update (1.87 or later) using Intel's Ethernet Flash Firmware Utility or appropriate tool
  8. Reboot the system to ensure both driver and firmware updates take effect
Caveat Ensure backup of current configuration and verify compatibility with your server/host system before applying firmware updates

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

Fix this in Ethernet Controller I225 It Firmware Scoped from the published advisory
  • Consultation2.0 h
  • Implementation4.0 h
  • Testing2.0 h
  • Review / QA1.0 h
9.0 hours of engineering $1,600
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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-2021-33142 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data