CVE-2025-43343Network attack vector

Remote WebKit process crash

Published Sep 15, 2025 · Updated Sep 15, 2025

Memory corruption in Apple WebKit before 26 allows remote attackers to crash a process by supplying maliciously crafted web content. Apple identifies WebKit Bugzilla 296490 but has not published the faulty function or memory operation, stating only that improved memory handling resolves the issue. Triggering requires a vulnerable WebKit process to handle attacker-controlled content, and the confirmed consequence is a process crash rather than system shutdown or code execution.

CVSS severity9.8
Critical
EPSS probability0.77%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in Apple WebKit before 26 allows remote attackers to crash a process by supplying maliciously crafted web content. Apple identifies WebKit Bugzilla 296490 but has not published the faulty function or memory operation, stating only that improved memory handling resolves the issue. Triggering requires a vulnerable WebKit process to handle attacker-controlled content, and the confirmed consequence is a process crash rather than system shutdown or code execution.

The record

CVE
CVE-2025-43343
Published
Sep 15, 2025
Updated
Sep 15, 2025
Vendor
Apple
Product
iOS and iPadOS
Classifications
CWE-119, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 15, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 15, 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 <26

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Apple · iOS and iPadOSversion=unspecified <26
Apple · visionOSversion=unspecified <26
Apple · Safariversion=unspecified <26
Apple · tvOSversion=unspecified <26
Apple · macOSversion=unspecified <26
Apple · watchOSversion=unspecified <26

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/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

CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
T1499.004Endpoint Denial of Service: Application 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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