CVE-2024-23259Network attack vector

Denial of service via insufficient web-content checks

Published Mar 8, 2024 · Updated Apr 2, 2026

Denial of service in Safari on affected iOS, iPadOS, and macOS releases allows remote attackers to interrupt browsing via web content. Safari performs insufficient checks while processing web content, but Apple has not disclosed the malformed input, code locus, or precise failure mode. A user must process attacker-controlled content; published evidence establishes an availability impact but does not distinguish a tab, browser, or system crash.

CVSS severity6.5
Medium
EPSS probability0.85%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Safari on affected iOS, iPadOS, and macOS releases allows remote attackers to interrupt browsing via web content. Safari performs insufficient checks while processing web content, but Apple has not disclosed the malformed input, code locus, or precise failure mode. A user must process attacker-controlled content; published evidence establishes an availability impact but does not distinguish a tab, browser, or system crash.

The record

CVE
CVE-2024-23259
Published
Mar 8, 2024
Updated
Apr 2, 2026
Vendor
Apple
Product
iOS and iPadOS
Classifications
CWE-400, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 8, 2024CVE publishedPublication date reported by the CVE source.
  2. Apr 2, 2026Record 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=0 <16.7.6
  2. Affected versionversion=0 <17.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Apple · iOS and iPadOSversion=0 <16.7.6; version=0 <17.4
Apple · macOSversion=0 <14.4

Published CVSS scores

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

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

CWE-400Uncontrolled Resource Consumption
T1499Endpoint Denial of Service

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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