What’s Vulnerable › Vulnerabilities

CVE-2018-4271

• Severity: medium (CVSS 6.5 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-04-03 · updated 2026-06-17
• Weakness: CWE-119

Description

Multiple memory corruption issues were addressed with improved input validation. This issue affected versions prior to iOS 11.4.1, tvOS 11.4.1, watchOS 4.3.2, Safari 11.1.2, iTunes 12.8 for Windows, iCloud for Windows 7.6.

Affected products

• Apple iCloud for Windows: before 7.6 — fixed in 7.6
• Apple Iphone Os: before 11.4.1 — fixed in 11.4.1
• Apple iTunes for Windows: before 12.8 — fixed in 12.8
• Apple Safari: before 11.1.2 — fixed in 11.1.2
• 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 iCloud for Windows 7.6; Apple Iphone Os 11.4.1; Apple iTunes for Windows 12.8; Apple Safari 11.1.2; Apple tvOS 11.4.1; Apple watchOS 4.3.2. Check the vendor advisory for mitigations.

References

• https://support.apple.com/kb/HT208932
• https://support.apple.com/kb/HT208933
• https://support.apple.com/kb/HT208934
• https://support.apple.com/kb/HT208935
• https://support.apple.com/kb/HT208936
• https://support.apple.com/kb/HT208938
• https://support.apple.com/kb/HT208932
• https://support.apple.com/kb/HT208933
• https://support.apple.com/kb/HT208934
• https://support.apple.com/kb/HT208935
• https://support.apple.com/kb/HT208936
• https://support.apple.com/kb/HT208938

Get alerted when CVE-2018-4271 or the next vulnerability affects your stack