Is CVE-2024-40856 in the CISA KEV catalog?

No. CVE-2024-40856 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2024-40856?

CVE-2024-40856 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2024-40856?

CVE-2024-40856 has an EPSS score of 0.89% (55th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2024-40856?

Upgrade ipados to 18.0 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2024-40856

HIGH

7.5

CVSS v3

NVD

Description

An integrity issue was addressed with Beacon Protection. This issue is fixed in iOS 18 and iPadOS 18, macOS Sequoia 15, tvOS 18. An attacker may be able to force a device to disconnect from a secure network.

How to fix

Remediation Available

ipadosNVD

Affected:< 18.0Fixed in:18.0CVE-2024-40856derived from NVD

iphone osNVD

Affected:< 18.0Fixed in:18.0CVE-2024-40856derived from NVD

macosNVD

Affected:< 15.0Fixed in:15.0CVE-2024-40856derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploit Intelligence

0.89%probability of exploitation in 30 days

55thpercentile

Moderate risk: more likely to be exploited than 55% of all known CVEs.

References

Vendor Advisory3

Other references3

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-02.