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CVE Record

CVE-2021-33128: Improper access control in the firmware for some Intel(R) E810 Ethernet Controllers before version 1.6.0.6...

Improper access control in the firmware for some Intel(R) E810 Ethernet Controllers before version 1.6.0.6 may allow a privileged user to potentially enable denial of service via local access.

MediumCVSS 4.4Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2021-33128 affects firmware for some Intel E810 Ethernet Controllers. A local privileged user could potentially trigger a denial of service. This is not a remote internet attack based on the supplied CVSS data, but it can matter on hosts where E810 adapters support critical network connectivity.

Executive priority

Treat as a targeted availability risk, not an emergency remote-code issue. Prioritize critical servers and shared environments first, then fold remaining firmware updates into normal hardware maintenance.

Technical view

The issue is improper access control in Intel E810 Ethernet Controller firmware. CVSS 3.1 is 4.4: local access, low attack complexity, high privileges, no user interaction, unchanged scope, and high availability impact only. The supplied data has a version inconsistency between before 1.6.0.6 and before 1.6.1.9.

Likely exposure

Exposure is limited to systems using affected Intel E810 Ethernet Controller firmware. Highest concern is servers or appliances where local administrators, tenants, or compromised privileged accounts could impact network availability.

Exploitation context

The source bundle does not show CISA KEV listing or cited evidence of active exploitation. Exploitation requires local access and high privileges, so this is mainly a post-compromise or insider availability risk.

Researcher notes

The key uncertainty is the affected-version boundary: the title and description cite firmware before 1.6.0.6, while affected metadata lists before 1.6.1.9. Use Intel SA-00593 as the authoritative reference before scoping or closing findings.

Mitigation direction

  • Inventory hosts using Intel E810 Ethernet Controllers.
  • Check Intel SA-00593 for the definitive affected firmware versions.
  • Update affected controller firmware using Intel or OEM guidance.
  • Prioritize systems where E810 adapters support critical network paths.
  • Restrict local administrative access on systems with affected adapters.

Validation and detection

  • Compare installed E810 firmware versions against Intel SA-00593.
  • Confirm whether each asset has Intel E810 hardware installed.
  • Review privileged local access paths to affected hosts.
  • Verify firmware updates through vendor-supported inventory or management tools.
Prepared
Confidence
medium
Sources
3

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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CVE-2021-33128 mapping review

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
4.4 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
0Timeline events
0ADP providers
2Source links

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
4.4CVSS 3.1MediumCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H0.83.6Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

4.4Medium
CVSS 3.1 vector shape for CVE-2021-33128Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/aIntel(R) E810 Ethernet Controllersbefore version 1.6.1.9Listed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.