CVE-2024-40856Network attack vector

Unauthenticated secure-network disconnection

Published Sep 16, 2024 · Updated Apr 2, 2026

Wi-Fi integrity failure in iOS and iPadOS before 18, tvOS before 18, and macOS before 15 allows attackers to disconnect secure networks. Apple identifies the locus only as Wi-Fi Beacon Protection and has not published the incorrect operation or the triggering input. No authentication or user interaction is required; the bounded consequence is loss of secure-network connectivity rather than data access or code execution.

CVSS severity7.5
High
EPSS probability0.89%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Wi-Fi integrity failure in iOS and iPadOS before 18, tvOS before 18, and macOS before 15 allows attackers to disconnect secure networks. Apple identifies the locus only as Wi-Fi Beacon Protection and has not published the incorrect operation or the triggering input. No authentication or user interaction is required; the bounded consequence is loss of secure-network connectivity rather than data access or code execution.

The record

CVE
CVE-2024-40856
Published
Sep 16, 2024
Updated
Apr 2, 2026
Vendor
Apple
Product
iOS and iPadOS
Classifications
T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 16, 2024CVE publishedPublication date reported by the CVE source.
  2. Apr 2, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <18

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Apple · iOS and iPadOSversion=0 <18
Apple · tvOSversion=0 <18
Apple · macOSversion=0 <15

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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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