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Vulnerability record · CVE-2018-4121 · published 3 April 2018

CVE-2018-4121: Apple safari memory buffer overflow vulnerability

Apple · Safari

An issue was discovered in certain Apple products. iOS before 11.3 is affected. Safari before 11.1 is affected. iCloud before 7.4 on Windows is affected. iTunes before 12.7.4 on Windows is affected. tvOS before 11.3 is affected. watchOS before 4.3 is affected. The issue involves the "WebKit" component. It allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption and application crash) via a crafted web site.

8.8 CVSS 3.0 High EPSS 13% · top 3.8% CWE-119 · Memory buffer overflow
8.8CVSS 3.0 base score, v2 6.8
13%EPSS exploitation probability, 30 days
NoNot in CISA KEV
6Affected product versions listed by NVD
20References, 4 tagged exploit
17 Jun 2026Last modified by NVD

Description

An issue was discovered in certain Apple products. iOS before 11.3 is affected. Safari before 11.1 is affected. iCloud before 7.4 on Windows is affected. iTunes before 12.7.4 on Windows is affected. tvOS before 11.3 is affected. watchOS before 4.3 is affected. The issue involves the "WebKit" component. It allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption and application crash) via a crafted web site.

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

Affected products

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

References

LinkTags
http://www.securitytracker.com/id/1040604 Third Party AdvisoryVDB Entry
https://github.com/mwrlabs/CVE-2018-4121 ExploitThird Party Advisory
https://security.gentoo.org/glsa/201808-04 Third Party Advisory
https://support.apple.com/HT208693 Vendor Advisory
https://support.apple.com/HT208694 Vendor Advisory
https://support.apple.com/HT208695 Vendor Advisory
https://support.apple.com/HT208696 Vendor Advisory
https://support.apple.com/HT208697 Vendor Advisory
https://support.apple.com/HT208698 Vendor Advisory
https://www.exploit-db.com/exploits/44427/ ExploitThird Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1040604 Third Party AdvisoryVDB Entry
https://github.com/mwrlabs/CVE-2018-4121 ExploitThird Party Advisory
https://security.gentoo.org/glsa/201808-04 Third Party Advisory
https://support.apple.com/HT208693 Vendor Advisory
https://support.apple.com/HT208694 Vendor Advisory
https://support.apple.com/HT208695 Vendor Advisory
https://support.apple.com/HT208696 Vendor Advisory
https://support.apple.com/HT208697 Vendor Advisory
https://support.apple.com/HT208698 Vendor Advisory
https://www.exploit-db.com/exploits/44427/ ExploitThird Party AdvisoryVDB Entry

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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-2018-4121), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.