CVE-2016-4448: Apple iCloud

Critical severity, CVSS 9.8. EPSS: 7% chance of exploitation in the next 30 days.

Format string vulnerability in libxml2 before 2.9.4 allows attackers to have unspecified impact via format string specifiers in unknown vectors.

Affected products

  • Apple iCloud: before 5.2.1 (fixed in 5.2.1)
  • Apple iPhone OS: up to and including 9.3.2
  • Apple iTunes: up to and including 12.4.1
  • Apple Mac OS X: before 10.11.6 (fixed in 10.11.6)
  • Apple tvOS: up to and including 9.2.1
  • Apple watchOS: up to and including 2.2.1
  • HP Icewall Federation Agent: version 3.0 only
  • McAfee Web Gateway: up to and including 7.5.2.10; from 7.6.0.0, up to and including 7.6.2.3
  • Oracle Linux: version 6 only; version 7 only
  • Oracle Vm Server: version 3.3 only; version 3.4 only
  • Red Hat Enterprise Linux Desktop: version 6.0 only; version 7.0 only
  • Red Hat Enterprise Linux Server: version 6.0 only; version 7.0 only
  • Red Hat Enterprise Linux Server Aus: version 7.2 only; version 7.3 only; version 7.4 only; version 7.6 only; version 7.7 only
  • Red Hat Enterprise Linux Server Eus: version 7.2 only; version 7.3 only; version 7.4 only; version 7.5 only; version 7.6 only; version 7.7 only
  • Red Hat Enterprise Linux Server Tus: version 7.2 only; version 7.3 only; version 7.6 only; version 7.7 only
  • Red Hat Enterprise Linux Workstation: version 6.0 only; version 7.0 only
  • Slackware Slackware Linux: version 14.0 only; version 14.1 only
  • Tenable Log Correlation Engine: version 4.8.0 only
  • Xmlsoft LIBXML2: up to and including 2.9.3

Published 2016-06-09. Last modified 2026-06-17.