What’s Vulnerable › Vulnerabilities

CVE-2018-4277

• Severity: high (CVSS 7.5 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-01-11 · updated 2026-06-17
• Weakness: CWE-20

Description

In iOS before 11.4.1, watchOS before 4.3.2, tvOS before 11.4.1, Safari before 11.1.1, macOS High Sierra before 10.13.6, a spoofing issue existed in the handling of URLs. This issue was addressed with improved input validation.

Affected products

• Apple Iphone Os: before 11.4.1 — fixed in 11.4.1
• macOS: before 10.13.6 — fixed in 10.13.6
• Apple Safari: before 11.1.1 — fixed in 11.1.1
• Apple tvOS: before 11.4.1 — fixed in 11.4.1
• Apple watchOS: before 4.3.2 — fixed in 4.3.2

How to fix

Upgrade to a fixed version: Apple Iphone Os 11.4.1; macOS 10.13.6; Apple Safari 11.1.1; Apple tvOS 11.4.1; Apple watchOS 4.3.2. Check the vendor advisory for mitigations.

References

• http://www.securitytracker.com/id/1041232
• https://support.apple.com/HT208854
• https://support.apple.com/HT208935
• https://support.apple.com/HT208936
• https://support.apple.com/HT208937
• https://support.apple.com/HT208938
• http://www.securitytracker.com/id/1041232
• https://support.apple.com/HT208854
• https://support.apple.com/HT208935
• https://support.apple.com/HT208936
• https://support.apple.com/HT208937
• https://support.apple.com/HT208938

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