CVE-2023-40414Network attack vector

Arbitrary code execution via WebKit use-after-free

Published Jan 10, 2024 · Updated Jun 20, 2025

Use-after-free in WebKit before iOS 17, iPadOS 17, tvOS 17, watchOS 10, macOS 14, and Safari 17 allows remote attackers to execute code. WebKit's web-content processing can access an object after its memory has been released; Apple has not disclosed the affected object or function. Delivery of attacker-controlled web content is required, and successful exploitation executes code in the WebKit process context.

CVSS severity9.8
Critical
EPSS probability1.04%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in WebKit before iOS 17, iPadOS 17, tvOS 17, watchOS 10, macOS 14, and Safari 17 allows remote attackers to execute code. WebKit's web-content processing can access an object after its memory has been released; Apple has not disclosed the affected object or function. Delivery of attacker-controlled web content is required, and successful exploitation executes code in the WebKit process context.

The record

CVE
CVE-2023-40414
Published
Jan 10, 2024
Updated
Jun 20, 2025
Vendor
Apple
Product
iOS and iPadOS
Classifications
CWE-416, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 10, 2024CVE publishedPublication date reported by the CVE source.
  2. Jun 20, 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?

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

  1. Affected versionversion=unspecified <17

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Apple · iOS and iPadOSversion=unspecified <17
Apple · Safariversion=unspecified <17
Apple · tvOSversion=unspecified <17
Apple · macOSversion=unspecified <14
Apple · watchOSversion=unspecified <10

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1203Exploitation for Client Execution

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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