CVE-2021-0198

Privileged local service interruption via undisclosed access control

Published Nov 17, 2021 · Updated Aug 3, 2024

Improper access control in Intel Ethernet Controller E810 firmware before 1.5.5.6 allows local users to cause a denial of service. Intel identifies the affected locus only as the controller firmware and does not disclose which access-control decision mishandles privileged input. High local privileges are required, and published materials do not distinguish whether exploitation hangs, crashes, or reboots the controller.

CVSS severity4.7
Medium
EPSS probability0.23%
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 E810 firmware before 1.5.5.6 allows local users to cause a denial of service. Intel identifies the affected locus only as the controller firmware and does not disclose which access-control decision mishandles privileged input. High local privileges are required, and published materials do not distinguish whether exploitation hangs, crashes, or reboots the controller.

The record

CVE
CVE-2021-0198
Published
Nov 17, 2021
Updated
Aug 3, 2024
Vendor
Topcon Positioning Systems, Inc.
Product
Intel Ethernet Controller E810
Classifications
T1499
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Nov 17, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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 1.5.5.6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Topcon Positioning Systems, Inc. · Intel Ethernet Controller E810version=before version 1.5.5.6

Published CVSS scores

4.7Intel CorporationCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:H
2.1NIST NVDAV:L/AC:L/Au:N/C:N/I:N/A:P
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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 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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