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Vulnerability record · CVE-2018-4124 · published 3 April 2018

CVE-2018-4124: Apple iphone os memory buffer overflow vulnerability

Apple · Iphone Os

An issue was discovered in certain Apple products. iOS before 11.2.6 is affected. macOS before 10.13.3 Supplemental Update is affected. tvOS before 11.2.6 is affected. watchOS before 4.2.3 is affected. The issue involves the "CoreText" component. It allows remote attackers to cause a denial of service (memory corruption and system crash) or possibly have unspecified other impact via a crafted string containing a certain Telugu character.

9.8 CVSS 3.0 Critical EPSS 5.9% · top 7.1% CWE-119 · Memory buffer overflow
9.8CVSS 3.0 base score, v2 9.0
5.9%EPSS exploitation probability, 30 days
NoNot in CISA KEV
4Affected product versions listed by NVD
12References
17 Jun 2026Last modified by NVD

Description

An issue was discovered in certain Apple products. iOS before 11.2.6 is affected. macOS before 10.13.3 Supplemental Update is affected. tvOS before 11.2.6 is affected. watchOS before 4.2.3 is affected. The issue involves the "CoreText" component. It allows remote attackers to cause a denial of service (memory corruption and system crash) or possibly have unspecified other impact via a crafted string containing a certain Telugu character.

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

4 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.securitytracker.com/id/1040396 Third Party AdvisoryVDB Entry
https://nakedsecurity.sophos.com/2018/02/20/apple-fixes-that-1-character-to-crash-your-mac-and-iphone-bug/ Third Party Advisory
https://support.apple.com/HT208534 Vendor Advisory
https://support.apple.com/HT208535 Vendor Advisory
https://support.apple.com/HT208536 Vendor Advisory
https://support.apple.com/HT208537 Vendor Advisory
http://www.securitytracker.com/id/1040396 Third Party AdvisoryVDB Entry
https://nakedsecurity.sophos.com/2018/02/20/apple-fixes-that-1-character-to-crash-your-mac-and-iphone-bug/ Third Party Advisory
https://support.apple.com/HT208534 Vendor Advisory
https://support.apple.com/HT208535 Vendor Advisory
https://support.apple.com/HT208536 Vendor Advisory
https://support.apple.com/HT208537 Vendor Advisory

Track CVE-2018-4124 inside VULONE

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2018-4124), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.