What’s Vulnerable › Vulnerabilities

CVE-2016-4609

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 5.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2016-07-22 · updated 2026-06-17
• Weakness: CWE-119

Description

libxslt in Apple iOS before 9.3.3, OS X before 10.11.6, iTunes before 12.4.2 on Windows, iCloud before 5.2.1 on Windows, tvOS before 9.2.2, and watchOS before 2.2.2 allows remote attackers to cause a denial of service (memory corruption) or possibly have unspecified other impact via unknown vectors, a different vulnerability than CVE-2016-4607, CVE-2016-4608, CVE-2016-4610, and CVE-2016-4612.

Affected products

• Apple iCloud for Windows: before 5.2.1 — fixed in 5.2.1
• Apple Iphone Os: before 9.3.3 — fixed in 9.3.3
• Apple iTunes for Windows: before 12.4.2 — fixed in 12.4.2
• macOS: before 10.11.6 — fixed in 10.11.6
• Apple tvOS: before 9.2.2 — fixed in 9.2.2
• Apple watchOS: before 2.2.2 — fixed in 2.2.2
• Debian Linux: 8.0
• Fedoraproject Fedora: 30
• xmlsoft libxslt: before 1.1.29 — fixed in 1.1.29

How to fix

Upgrade to a fixed version: Apple iCloud for Windows 5.2.1; Apple Iphone Os 9.3.3; Apple iTunes for Windows 12.4.2; macOS 10.11.6; Apple tvOS 9.2.2; Apple watchOS 2.2.2; xmlsoft libxslt 1.1.29. Check the vendor advisory for mitigations.

References

• http://lists.apple.com/archives/security-announce/2016/Jul/msg00000.html
• http://lists.apple.com/archives/security-announce/2016/Jul/msg00001.html
• http://lists.apple.com/archives/security-announce/2016/Jul/msg00002.html
• http://lists.apple.com/archives/security-announce/2016/Jul/msg00003.html
• http://lists.apple.com/archives/security-announce/2016/Jul/msg00005.html
• http://www.securityfocus.com/bid/91826
• http://www.securitytracker.com/id/1036348
• https://lists.debian.org/debian-lts-announce/2019/07/msg00020.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SK4YNISS22MJY22YX5I6V2U63QZAUEHA/
• https://support.apple.com/HT206899
• https://support.apple.com/HT206901
• https://support.apple.com/HT206902

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