CVE-2024-21859

Privileged information disclosure via improper buffer restrictions

Published Feb 12, 2025 · Updated Feb 13, 2025

Improper buffer restrictions in Intel processor UEFI firmware allow local users with high privileges to disclose sensitive data. Intel identifies the flaw only as improper buffer restrictions and has not disclosed the affected firmware routine, input, or incorrect bounds operation. Exploitation requires high local privileges, high complexity, and additional attack conditions; the published impact is limited to confidentiality.

CVSS severity6.8
Medium
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper buffer restrictions in Intel processor UEFI firmware allow local users with high privileges to disclose sensitive data. Intel identifies the flaw only as improper buffer restrictions and has not disclosed the affected firmware routine, input, or incorrect bounds operation. Exploitation requires high local privileges, high complexity, and additional attack conditions; the published impact is limited to confidentiality.

The record

CVE
CVE-2024-21859
Published
Feb 12, 2025
Updated
Feb 13, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-119
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Feb 12, 2025CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 2025Record 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

5.3Intel CorporationCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:N/A:N
6.8Intel CorporationCVSS:4.0/AV:L/AC:H/AT:P/PR:H/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N

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-119Improper Restriction of Operations within the Bounds of a Memory Buffer

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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