The vulnerability was discovered by Costin Raiu and Vitaly Kamluk of Kaspersky Labs.
Exploited by Animal Farm group.
Vulnerable component: Adobe Reader
CVSSv3 score: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:H/RL:O/RC:C
CWE-ID: CWE-20 - Improper Input Validation
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The weakness exists due to improper input validation when processing .pdf files. A remote attacker can create a specially crafted file, trick the victim into opening it, bypass sandbox restrictions and execute arbitrary code with privileges of the current user.
Successful exploitation of the vulnerability results in arbitrary code execution on the vulnerable system.
Note: the vulnerability was being actively exploited.