CVE-2018-4431

MEDIUMNVD 5.55.5—Elevated

5.5

A memory initialization issue was addressed with improved memory handling. This issue affected versions prior to iOS 12.1.1, macOS Mojave 10.14.2, tvOS 12.1.1, watchOS 5.1.2.

CVSS v3: 5.5
EG Score: 5.5(medium)
EPSS: 83.9%
KEV: Not listed

Published

April 3, 2019

Last Modified

November 21, 2024

References (8)

product-security@applehttps://support.apple.com/kb/HT209340
product-security@applehttps://support.apple.com/kb/HT209341
product-security@applehttps://support.apple.com/kb/HT209342
product-security@applehttps://support.apple.com/kb/HT209343
af854a3a-2127-422b-91ae-364da2661108https://support.apple.com/kb/HT209340
af854a3a-2127-422b-91ae-364da2661108https://support.apple.com/kb/HT209341
af854a3a-2127-422b-91ae-364da2661108https://support.apple.com/kb/HT209342
af854a3a-2127-422b-91ae-364da2661108https://support.apple.com/kb/HT209343

Weakness Classification(1)

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

CWE-200Exposure of Sensitive Information to an Unauthorized Actor

Data Freshness Timeline

(refreshed 12× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-06 13:45 UTCepss_batch
2026-06-06 13:45 UTCepss_batch
2026-06-05 22:45 UTCepss_batch
2026-06-05 22:45 UTCepss_batch
2026-06-05 06:08 UTCepss_batch
2026-06-05 06:08 UTCepss_batch
2026-06-04 13:10 UTCepss_batch
2026-06-04 13:10 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 00:14 UTCepss_batch
2026-05-31 00:14 UTCepss_batch
2026-05-29 13:41 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-28 13:42 UTCepss_batch
2026-05-27 21:01 UTCEG score recompute
2026-05-27 21:01 UTCGHSA enrichment
2026-05-27 13:38 UTCepss_batch

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

GitHub PoCktiOSz/PoC_iOS12
First seen Dec 28, 2018
PoC Exploit iOS 12 to iOS 12.1 (CVE-2018-4431)
Open source ↗

Frequently asked(5)

What is CVE-2018-4431?

CVE-2018-4431 is a medium vulnerability published on April 3, 2019. A memory initialization issue was addressed with improved memory handling. This issue affected versions prior to iOS 12.1.1, macOS Mojave 10.14.2, tvOS 12.1.1, watchOS 5.1.2.

When was CVE-2018-4431 disclosed?

CVE-2018-4431 was first published in the National Vulnerability Database on April 3, 2019, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2018-4431 actively exploited?

CVE-2018-4431 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 83.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2018-4431?

CVE-2018-4431 has a CVSS v3 base score of 5.5 (NVD).

How do I remediate CVE-2018-4431?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-4431, 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-2018-4431

📅 Published

🔄 Last Modified

🔗 References (8)

Weakness Classification(1)

Data Freshness Timeline

Publicly available exploits

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2018-4431?

🔗 Related CVEs(same CWE)

Same CWE

Published

Last Modified

References (8)

Frequently asked(5)

Related CVEs(same CWE)