Exploited in the wild via malicious PDF files.
Vulnerable component: Apple iOS
CVSSv3 score: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:F/RL:O/RC:C
CWE-ID: CWE-190 - Integer Overflow or Wraparound
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to integer overflow when handling of Type 1 fonts by FreeType. A remote attacker can send a specially crafted PDF file, trick the victim into opening it, trigger memory corruption and execute arbitrary code with privileges of the current user.
Successful exploitation of the vulnerability results in compromise of vulnerable system.
Note: the vulnerability was being actively exploited.