CVE-2024-52879

Firmware interruption via unbounded variable-name comparison

Published May 15, 2025 · Updated May 19, 2025

Buffer over-read in Insyde InsydeH2O VariableRuntimeDxe allows local users with high privileges to interrupt firmware execution through an SMM callback. The SmmUpdateVariablePropertySmi callback compares a variable name with StrCmp without a length-bounded comparison, so the operation can read beyond the name buffer. Vendor assessment requires local high privileges and bounds the effect to availability; the advisory does not identify whether interruption takes the form of a crash, hang, or reboot.

CVSS severity5.3
Medium
EPSS probability0.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer over-read in Insyde InsydeH2O VariableRuntimeDxe allows local users with high privileges to interrupt firmware execution through an SMM callback. The SmmUpdateVariablePropertySmi callback compares a variable name with StrCmp without a length-bounded comparison, so the operation can read beyond the name buffer. Vendor assessment requires local high privileges and bounds the effect to availability; the advisory does not identify whether interruption takes the form of a crash, hang, or reboot.

The record

CVE
CVE-2024-52879
Published
May 15, 2025
Updated
May 19, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-126, T1499
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. May 15, 2025CVE publishedPublication date reported by the CVE source.
  2. May 19, 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

5.3Insyde SoftwareCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:N/I:N/A:H
7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A: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-126Buffer Over-read
T1499Endpoint Denial of Service

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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