The vulnerability is believed to be used against Bahraini activists.
Vulnerable component: Apple iOS
CVSSv3 score: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:H/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 processing PDF files within the CoreGraphics component. A remote attacker can trick the victim to open a specially crafted PDF file, trigger integer overflow and execute arbitrary code on the target system.
Note, the vulnerability is being active exploited in-the-wild via the FORCEDENTRY tool against Bahraini activists.