CVE-2023-38595Network attack vector

Arbitrary code execution via B3 integer overflow

Published Jul 27, 2023 · Updated Feb 13, 2025

Integer overflow in WebKit before iOS/iPadOS 16.6, tvOS 16.6, macOS 13.5, Safari 16.6, or watchOS 9.6 allows remote attackers to execute code. JavaScriptCore's B3 multiplication optimization performs an unsafe integer calculation; Apple has not published further implementation detail. Exploitation requires a user or application to process attacker-controlled web content, with resulting code execution in the WebKit process.

CVSS severity8.8
High
EPSS probability1.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in WebKit before iOS/iPadOS 16.6, tvOS 16.6, macOS 13.5, Safari 16.6, or watchOS 9.6 allows remote attackers to execute code. JavaScriptCore's B3 multiplication optimization performs an unsafe integer calculation; Apple has not published further implementation detail. Exploitation requires a user or application to process attacker-controlled web content, with resulting code execution in the WebKit process.

The record

CVE
CVE-2023-38595
Published
Jul 27, 2023
Updated
Feb 13, 2025
Vendor
Apple
Product
iOS and iPadOS
Classifications
T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 27, 2023CVE 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 <16.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Apple · iOS and iPadOSversion=unspecified <16.6
Apple · Safariversion=unspecified <16.6
Apple · tvOSversion=unspecified <16.6
Apple · macOSversion=unspecified <13.5
Apple · watchOSversion=unspecified <9.6

Published CVSS scores

8.8NIST NVDCVSS: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 exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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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