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82599en FirmwareOperating system · Intel

CVE-2021-33096

MEDIUM · 5.5 CVSS v3.1 Published 2022-02-09
Fix available
A fix is available. Upgrade to 5.13.4 or later.
See remediation →
57/100
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 isolation of shared resources in network on chip for the Intel(R) 82599 Ethernet Controllers and Adapters may allow an authenticated 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 isolation of shared resources in the network-on-chip (NoC) of Intel 82599 Ethernet Controllers and Adapters allows an authenticated local user to potentially cause denial of service by interfering with shared NoC resources.

MitigationApply Intel firmware/boot software updates for the 82599 Ethernet Controllers and Adapters; if updates unavailable, consider replacing affected adapters with newer models.

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
82599en FirmwareOperating system
Affected:< 5.13.4
82599eb FirmwareOperating system
Affected:< 5.13.4
82599es FirmwareOperating system
Affected:< 5.13.4

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
Low
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/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 82599 adapter in the system
    Run 'lspci | grep -i 82599' or 'ip link show' to list network interfaces, then check the device details using 'lspci -nnk' to locate an Intel 82599 Ethernet Controller (product codes like 82599EN, 82599EB, or 82599ES)
    Affected if An Intel 82599en, 82599eb, or 82599es adapter is present in the system
  2. Retrieve the firmware version of the adapter
    Run 'ethtool -i <interface>' where <interface> is the network interface name (e.g., eth0, ens33) corresponding to the 82599 adapter; look for the 'firmware-version' field
    Affected if The firmware version displayed is lower than 5.13.4 (for example, 5.0.x, 5.1.x, 5.2.x, or any version below 5.13.4)
  3. Confirm the specific 82599 variant
    Use 'lspci -vv -s <device_bdf>' to view detailed device information, or check the adapter's physical label or Intel product specification to confirm whether it is an 82599en, 82599eb, or 82599es model
    Affected if The adapter is specifically an 82599en, 82599eb, or 82599es variant with firmware < 5.13.4

A system is affected if it contains an Intel 82599en, 82599eb, or 82599es Ethernet adapter with firmware version installed below 5.13.4.

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 5.13.4 or later
Fixed in 5.13.4
Interim mitigation

Apply Intel firmware/boot software updates for the 82599 Ethernet Controllers and Adapters; if updates unavailable, consider replacing affected adapters with newer models.

Recommended fix High confidence

Intel 82599 Ethernet Controller/Adapter Firmware version 5.13.4 or later

  1. 1. Identify the specific Intel 82599 Ethernet Controller or Adapter model number in your environment
  2. 2. Navigate to the Intel support website (www.intel.com) and locate the drivers and support page for your specific adapter model
  3. 3. Download the firmware package version 5.13.4 or later for the 82599 adapter
  4. 4. Review the firmware update instructions provided in the Intel Ethernet Connections Boot Utility or Intel Network Adapter User Guide
  5. 5. Back up current adapter configuration if applicable
  6. 6. Apply the firmware update using the Intel firmware update utility (e.g., BootUtil, NVMUpdate, or relevant management tool)
  7. 7. Reboot the system or adapter as instructed by the firmware update process
  8. 8. Verify the firmware version has been updated to 5.13.4 or later using the adapter management tools
Caveat Firmware updates may require system downtime; verify compatibility with your specific adapter model and ensure backup of configuration before proceeding

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

Fix this in 82599en Firmware Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing6.0 h
  • Review / QA3.0 h
21.0 hours of engineering $3,680
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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-2021-33096 in production — separate from our analysis above.

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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