CVE-2024-40817Network attack vector

UI spoofing via framed malicious content

Published Jul 29, 2024 · Updated Apr 2, 2026

UI spoofing in Apple Safari before 17.6 and affected macOS releases allows remote attackers to misrepresent framed website content. Apple states only that flawed UI handling permits a website to frame malicious content and has not disclosed the affected code path or erroneous operation. Exploitation requires a user to visit the website; the resulting deception can alter what the user believes the browser interface or framed content represents.

CVSS severity6.1
Medium
EPSS probability0.69%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

UI spoofing in Apple Safari before 17.6 and affected macOS releases allows remote attackers to misrepresent framed website content. Apple states only that flawed UI handling permits a website to frame malicious content and has not disclosed the affected code path or erroneous operation. Exploitation requires a user to visit the website; the resulting deception can alter what the user believes the browser interface or framed content represents.

The record

CVE
CVE-2024-40817
Published
Jul 29, 2024
Updated
Apr 2, 2026
Vendor
Apple
Product
Safari
Classifications
CWE-1021
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 29, 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 <17.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Apple · Safariversion=0 <17.6
Apple · macOSversion=0 <12.7.6; version=0 <13.6.8; version=0 <14.6

Published CVSS scores

6.1CISA ADP VulnrichmentCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

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-1021Improper Restriction of Rendered UI Layers or Frames

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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