CVE-2023-42917Known exploitationNetwork attack vector

Code execution via inadequate memory locking

Published Nov 30, 2023 · Updated Oct 21, 2025

Memory corruption in WebKit in Apple iOS, iPadOS, macOS, and Safari allows remote attackers to execute code via crafted web content. Apple attributes the corruption to inadequate locking in WebKit but has not disclosed the affected function, object, or race sequence. Exploitation requires a target to process attacker-supplied web content; resulting code execution runs in the context of the affected WebKit process.

CVSS severity8.8
High
EPSS probability9.37%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in WebKit in Apple iOS, iPadOS, macOS, and Safari allows remote attackers to execute code via crafted web content. Apple attributes the corruption to inadequate locking in WebKit but has not disclosed the affected function, object, or race sequence. Exploitation requires a target to process attacker-supplied web content; resulting code execution runs in the context of the affected WebKit process.

The record

CVE
CVE-2023-42917
Published
Nov 30, 2023
Updated
Oct 21, 2025
Vendor
Apple
Product
iOS and iPadOS
Classifications
CWE-787, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 30, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 21, 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 <17.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Apple · iOS and iPadOSversion=unspecified <17.1
Apple · Safariversion=unspecified <17.1
Apple · macOSversion=unspecified <14.1

Published CVSS scores

8.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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Reported exploitation

Technologies

Your stack

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Your stack

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