What’s Vulnerable › Vulnerabilities

CVE-2018-4124

• Severity: critical (CVSS 9.8 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 5.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2018-04-03 · updated 2026-06-17
• Weakness: CWE-119

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.

Affected products

• Apple Iphone Os: before 11.2.6 — fixed in 11.2.6
• macOS: before 10.13.3 — fixed in 10.13.3
• Apple tvOS: before 11.2.6 — fixed in 11.2.6
• Apple watchOS: before 4.2.3 — fixed in 4.2.3

How to fix

Upgrade to a fixed version: Apple Iphone Os 11.2.6; macOS 10.13.3; Apple tvOS 11.2.6; Apple watchOS 4.2.3. Check the vendor advisory for mitigations.

References

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

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