CVE-2023-42956Network attack vector

Denial of service via undisclosed WebKit memory handling

Published Mar 28, 2024 · Updated Feb 13, 2025

A memory-handling flaw in WebKit in Safari, iOS, and iPadOS before 17.2 and macOS before 14.2 allows remote attackers to interrupt service. Apple identifies deficient memory handling during web-content processing but has not published the affected WebKit function or erroneous operation. Exploitation requires a user to process attacker-controlled web content; Apple has not stated whether the interruption is a hang or crash.

CVSS severity6.5
Medium
EPSS probability0.98%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A memory-handling flaw in WebKit in Safari, iOS, and iPadOS before 17.2 and macOS before 14.2 allows remote attackers to interrupt service. Apple identifies deficient memory handling during web-content processing but has not published the affected WebKit function or erroneous operation. Exploitation requires a user to process attacker-controlled web content; Apple has not stated whether the interruption is a hang or crash.

The record

CVE
CVE-2023-42956
Published
Mar 28, 2024
Updated
Feb 13, 2025
Vendor
Apple
Product
iOS and iPadOS
Classifications
T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 28, 2024CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 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 <17.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Apple · iOS and iPadOSversion=unspecified <17.2
Apple · Safariversion=unspecified <17.2
Apple · macOSversion=unspecified <14.2

Published CVSS scores

6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/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.

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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

T1499.004Application or System Exploitation

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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