CVE-2020-0523

Privileged local denial of service via firmware controls

Published Feb 17, 2021 · Updated Aug 4, 2024

Improper access control in Intel Ethernet Controller I210 Series firmware before 3.30 allows privileged local users to cause denial of service. The advisory identifies firmware access control as the locus but does not disclose the specific operation or interface that accepts unauthorized requests. Exploitation requires privileged local access to the adapter, and the reported consequence is service interruption without stated confidentiality impact.

CVSS severity5.1
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in Intel Ethernet Controller I210 Series firmware before 3.30 allows privileged local users to cause denial of service. The advisory identifies firmware access control as the locus but does not disclose the specific operation or interface that accepts unauthorized requests. Exploitation requires privileged local access to the adapter, and the reported consequence is service interruption without stated confidentiality impact.

The record

CVE
CVE-2020-0523
Published
Feb 17, 2021
Updated
Aug 4, 2024
Vendor
Intel Corporation
Product
Intel Ethernet Controller I210 Series
Classifications
T1499
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Feb 17, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=before version 3.30

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Intel Corporation · Intel Ethernet Controller I210 Seriesversion=before version 3.30

Published CVSS scores

5.1Intel CorporationCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H
4.4NIST NVDCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

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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