Symantec has seen the exploitation being used in targeted attacks since May, but it has been limited to users in Japan and the volume of attacks has been minimal.
Vulnerable component: Ichitaro
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-120 - Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The weakness exists due to buffer overflow when processing office documents. A remote attacker can create a specially crafted document, 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 arbitrary code on the vulnerable system.
Note: the vulnerability was being actively exploited.