CVE-2023-43000Known exploitationPublic exploitNetwork attack vector

Remote code execution via WebKit use-after-free

Published Nov 5, 2025 · Updated Mar 12, 2026

A WebKit use-after-free in affected Apple releases allows remote attackers to execute code through maliciously crafted web content. Apple identifies WebKit Bugzilla 255951 but has not disclosed which object is freed while still reachable. A victim must load attacker-controlled content, and observed Coruna chains exploit the flaw on affected iPhones.

CVSS severity8.8
High
EPSS probability3.90%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A WebKit use-after-free in affected Apple releases allows remote attackers to execute code through maliciously crafted web content. Apple identifies WebKit Bugzilla 255951 but has not disclosed which object is freed while still reachable. A victim must load attacker-controlled content, and observed Coruna chains exploit the flaw on affected iPhones.

The record

CVE
CVE-2023-43000
Published
Nov 5, 2025
Updated
Mar 12, 2026
Vendor
Apple
Product
iOS and iPadOS
Classifications
CWE-416, T1658, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 1, 2025Exploitation reportedUNC6353 and UNC6691 use of Coruna
  2. Jun 1, 2025Exploitation reportedCoruna campaigns
  3. Nov 5, 2025CVE publishedPublication date reported by the CVE source.
  4. Mar 5, 2026Exploitation reportedCISA Known Exploited Vulnerabilities catalog listing
  5. Mar 12, 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=unspecified <15.8.7
  2. Affected versionversion=unspecified <16.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Apple · iOS and iPadOSversion=unspecified <15.8.7; version=unspecified <16.6
Apple · Safariversion=unspecified <16.6
Apple · macOSversion=unspecified <13.5

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
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 exploitPublished

Weakness, pattern, technique

CWE-416Use After Free
T1658Exploitation for Client Execution
T1203Exploitation for Client Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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