CVE-2024-43420

Local data disclosure via shared predictor state

Published May 13, 2025 · Updated Nov 3, 2025

Information disclosure in Intel Atom processors allows local users to infer sensitive data through shared indirect-branch predictor state. The predictor shares microarchitectural state across a hardware protection boundary, allowing attacker-influenced predictions to steer victim transient execution and expose data through a covert channel. A low-privileged local account and favorable microarchitectural conditions are required; the disclosed impact is limited to confidentiality, without data modification or service interruption.

CVSS severity5.7
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Intel Atom processors allows local users to infer sensitive data through shared indirect-branch predictor state. The predictor shares microarchitectural state across a hardware protection boundary, allowing attacker-influenced predictions to steer victim transient execution and expose data through a covert channel. A low-privileged local account and favorable microarchitectural conditions are required; the disclosed impact is limited to confidentiality, without data modification or service interruption.

The record

CVE
CVE-2024-43420
Published
May 13, 2025
Updated
Nov 3, 2025
Vendor
Topcon Positioning Systems, Inc.
Product
Intel Atom Processors
Classifications
CWE-1423, T1005
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 13, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 3, 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?

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  1. Affected versionversion=See references

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Topcon Positioning Systems, Inc. · Intel Atom Processorsversion=See references

Published CVSS scores

5.7IntelCVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
5.6IntelCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1423Exposure of Sensitive Information caused by Shared Microarchitectural Predictor State that Influences Transient Execution
T1005Data from Local System

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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