CVE-2021-33158

Privileged local escalation via undisclosed neutralization flaw

Published May 16, 2024 · Updated Aug 3, 2024

Improper neutralization in Intel Ethernet Adapters and I225 firmware allows local users with privileged access to escalate privileges. Intel has not disclosed the affected locus, the identifier involved, or how invalid characters are processed without proper neutralization. Exploitation requires local access, high privileges, and complex conditions and permits protected-state changes or service interruption, not data disclosure.

CVSS severity7.2
High
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper neutralization in Intel Ethernet Adapters and I225 firmware allows local users with privileged access to escalate privileges. Intel has not disclosed the affected locus, the identifier involved, or how invalid characters are processed without proper neutralization. Exploitation requires local access, high privileges, and complex conditions and permits protected-state changes or service interruption, not data disclosure.

The record

CVE
CVE-2021-33158
Published
May 16, 2024
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-86, T1068
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. May 16, 2024CVE 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.2Intel CorporationCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:N/I:H/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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

CWE-86Improper Neutralization of Invalid Characters in Identifiers in Web Pages
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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