CVE-2023-39434

HIGHNVD 8.88.8—

8.8

A use-after-free issue was addressed with improved memory management. This issue is fixed in iOS 17 and iPadOS 17, watchOS 10, macOS Sonoma 14. Processing web content may lead to arbitrary code execution.

CVSS v3: 8.8
EG Score: 8.8(medium)
EPSS: 71.3%
KEV: Not listed

Published

September 27, 2023

Last Modified

May 2, 2025

References (17)

product-security@applehttp://seclists.org/fulldisclosure/2023/Oct/3
product-security@applehttp://seclists.org/fulldisclosure/2023/Oct/8
product-security@applehttp://seclists.org/fulldisclosure/2023/Oct/9
product-security@applehttp://www.openwall.com/lists/oss-security/2023/09/28/3
product-security@applehttps://security.gentoo.org/glsa/202401-33
product-security@applehttps://support.apple.com/en-us/HT213937
product-security@applehttps://support.apple.com/en-us/HT213938
product-security@applehttps://support.apple.com/en-us/HT213940
af854a3a-2127-422b-91ae-364da2661108http://seclists.org/fulldisclosure/2023/Oct/3
af854a3a-2127-422b-91ae-364da2661108http://seclists.org/fulldisclosure/2023/Oct/8
af854a3a-2127-422b-91ae-364da2661108http://seclists.org/fulldisclosure/2023/Oct/9
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2023/09/28/3
af854a3a-2127-422b-91ae-364da2661108https://security.gentoo.org/glsa/202401-33
af854a3a-2127-422b-91ae-364da2661108https://support.apple.com/en-us/HT213937
af854a3a-2127-422b-91ae-364da2661108https://support.apple.com/en-us/HT213938

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-416Use After Free

Data Freshness Timeline

(refreshed 11× in last 7d / 58× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

2026-06-23 21:31 UTCEPSS rescore
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2026-06-21 14:55 UTCEPSS rescore
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2026-06-09 20:17 UTCOSV refresh
2026-06-08 14:16 UTCEPSS rescore
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2026-06-07 15:23 UTCEPSS rescore
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2026-06-06 13:46 UTCEPSS rescore
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2026-05-31 22:30 UTCEPSS rescore
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2026-05-26 07:18 UTCEPSS rescore
2026-05-26 07:18 UTCEPSS rescore
2026-05-26 07:18 UTCEPSS rescore
2026-05-24 17:07 UTCEG score recompute
2026-05-24 17:07 UTCGHSA enrichment
2026-05-24 16:52 UTCEPSS rescore
2026-05-23 14:11 UTCOSV refresh

Frequently asked(5)

What is CVE-2023-39434?

CVE-2023-39434 is a high vulnerability published on September 27, 2023. A use-after-free issue was addressed with improved memory management. This issue is fixed in iOS 17 and iPadOS 17, watchOS 10, macOS Sonoma 14. Processing web content may lead to arbitrary code execution.

When was CVE-2023-39434 disclosed?

CVE-2023-39434 was first published in the National Vulnerability Database on September 27, 2023, with the most recent update on May 2, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2023-39434 actively exploited?

CVE-2023-39434 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 71.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2023-39434?

CVE-2023-39434 has a CVSS v3 base score of 8.8 (NVD).

How do I remediate CVE-2023-39434?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-39434, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2023-39434

📅 Published

🔄 Last Modified

🔗 References (17)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2023-39434?

🔗 Related CVEs(same CWE)

Same CWE

Published

Last Modified

References (17)

Frequently asked(5)

Related CVEs(same CWE)