Is CVE-2023-40400 in the CISA KEV catalog?

No. CVE-2023-40400 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2023-40400?

CVE-2023-40400 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2023-40400?

CVE-2023-40400 has an EPSS score of 1.52% (72th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2023-40400?

Upgrade ipados to 16.6 or later. Fixes are available for 5 affected products.

CVE & CISA-KEV Catalog

CVE-2023-40400

CRITICALEPSS 72th pctl

9.8

CVSS v3

NVD

Description

This issue was addressed with improved checks. This issue is fixed in tvOS 17, iOS 17 and iPadOS 17, watchOS 10, macOS Sonoma 14. A remote user may cause an unexpected app termination or arbitrary code execution.

How to fix

Remediation Available

ipadosNVD

Affected:< 16.6Fixed in:16.6CVE-2023-40400derived from NVD

iphone osNVD

Affected:< 16.6Fixed in:16.6CVE-2023-40400derived from NVD

macosNVD

Affected:< 14.0Fixed in:14.0CVE-2023-40400derived from NVD

tvosNVD

Affected:< 17.0Fixed in:17.0CVE-2023-40400derived from NVD

watchosNVD

Affected:< 10.0Fixed in:10.0CVE-2023-40400derived 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

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

1.52%probability of exploitation in 30 days

72ndpercentile

Elevated risk: more likely to be exploited than 72% of all known CVEs.

References

Vendor Advisory5

Third-Party Advisory4

Other references4

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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 2025-11-04.