What’s Vulnerable › Vulnerabilities

CVE-2016-1856

• Severity: high (CVSS 8.8 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2016-05-20 · updated 2026-06-17
• Weakness: CWE-119

Description

WebKit, as used in Apple iOS before 9.3.2, Safari before 9.1.1, and tvOS before 9.2.1, allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted web site, a different vulnerability than CVE-2016-1854, CVE-2016-1855, and CVE-2016-1857.

Affected products

• Apple Iphone Os: before 9.3.2 — fixed in 9.3.2
• Apple Safari: before 9.1.1 — fixed in 9.1.1
• Apple tvOS: before 9.2.1 — fixed in 9.2.1
• Webkitgtk+: before 2.12.1 — fixed in 2.12.1

How to fix

Upgrade to a fixed version: Apple Iphone Os 9.3.2; Apple Safari 9.1.1; Apple tvOS 9.2.1; Webkitgtk+ 2.12.1. Check the vendor advisory for mitigations.

References

• http://lists.apple.com/archives/security-announce/2016/May/msg00001.html
• http://lists.apple.com/archives/security-announce/2016/May/msg00002.html
• http://lists.apple.com/archives/security-announce/2016/May/msg00005.html
• http://packetstormsecurity.com/files/137229/WebKitGTK-Code-Execution-Denial-Of-Service-Memory-Corruption.html
• http://www.securityfocus.com/archive/1/538522/100/0/threaded
• http://www.securitytracker.com/id/1035888
• http://www.zerodayinitiative.com/advisories/ZDI-16-342
• https://support.apple.com/HT206564
• https://support.apple.com/HT206565
• https://support.apple.com/HT206568
• http://lists.apple.com/archives/security-announce/2016/May/msg00001.html
• http://lists.apple.com/archives/security-announce/2016/May/msg00002.html

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