CVE-2018-4248

HIGHNVD 7.57.5—Elevated

7.5

An out-of-bounds read was addressed with improved input validation. This issue affected versions prior to iOS 11.4.1, macOS High Sierra 10.13.6, tvOS 11.4.1, watchOS 4.3.2.

CVSS v3: 7.5
EG Score: 7.5(medium)
EPSS: 86.1%
KEV: Not listed

Published

April 3, 2019

Last Modified

November 21, 2024

References (8)

product-security@applehttps://support.apple.com/kb/HT208935
product-security@applehttps://support.apple.com/kb/HT208936
product-security@applehttps://support.apple.com/kb/HT208937
product-security@applehttps://support.apple.com/kb/HT208938
af854a3a-2127-422b-91ae-364da2661108https://support.apple.com/kb/HT208935
af854a3a-2127-422b-91ae-364da2661108https://support.apple.com/kb/HT208936
af854a3a-2127-422b-91ae-364da2661108https://support.apple.com/kb/HT208937
af854a3a-2127-422b-91ae-364da2661108https://support.apple.com/kb/HT208938

Weakness Classification(1)

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

CWE-125Out-of-bounds Read

Data Freshness Timeline

(refreshed 9× in last 7d / 18× 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.

2026-06-04 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 21:08 UTCEG score recompute
2026-05-27 21:08 UTCGHSA enrichment
2026-05-27 13:38 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 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 PoCbazad/xpc-string-leak
First seen May 10, 2018
CVE-2018-4248: Out-of-bounds read in libxpc during string serialization.
Open source ↗

Frequently asked(5)

What is CVE-2018-4248?

CVE-2018-4248 is a high vulnerability published on April 3, 2019. An out-of-bounds read was addressed with improved input validation. This issue affected versions prior to iOS 11.4.1, macOS High Sierra 10.13.6, tvOS 11.4.1, watchOS 4.3.2.

When was CVE-2018-4248 disclosed?

CVE-2018-4248 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-2018-4248 actively exploited?

CVE-2018-4248 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 86.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2018-4248?

CVE-2018-4248 has a CVSS v3 base score of 7.5 (NVD).

How do I remediate CVE-2018-4248?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-4248, 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-2018-4248

📅 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-2018-4248?

🔗 Related CVEs(same CWE)

Same CWE

Published

Last Modified

References (8)

Frequently asked(5)

Related CVEs(same CWE)