CVE-2021-0197

Local denial of service via firmware protection failure

Published Nov 17, 2021 · Updated Aug 3, 2024

Protection mechanism failure in Intel Ethernet Controller E810 firmware before 1.5.5.6 allows local users to cause denial of service. Intel has not published the affected firmware locus or the operation that defeats its protection mechanism. Administrative access to the host is required, and exploitation can interrupt service on the affected controller.

CVSS severity5.1
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

Protection mechanism failure in Intel Ethernet Controller E810 firmware before 1.5.5.6 allows local users to cause denial of service. Intel has not published the affected firmware locus or the operation that defeats its protection mechanism. Administrative access to the host is required, and exploitation can interrupt service on the affected controller.

The record

CVE
CVE-2021-0197
Published
Nov 17, 2021
Updated
Aug 3, 2024
Vendor
Intel Corporation
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?

Intel Corporation · Intel Ethernet Controller E810version=before version 1.5.5.6

Published CVSS scores

4.4NIST NVDCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
5.1Intel CorporationCVSS:3.1/AV:L/AC:L/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

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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