This indicates an attack attempt to exploit a Memory Corruption vulnerability in Adobe Flash Player.
The vulnerability is due to an error when the vulnerable software handles a maliciously crafted SWF file. A remote attacker may be able to exploit this to execute arbitrary code within the context of the affected application, via a crafted SWF file.
Adobe Flash Player Desktop Runtime 188.8.131.52 and earlier version for Windows and macOS
Adobe Flash Player for Google Chrome 184.108.40.206 and earlier version for Windows, macOS, Linux and ChromeOS
Adobe Flash Player for Microsoft Edge and Internet Explorer 11 220.127.116.11 and earlier version for Windows 10 and 8.1
Adobe Flash Player for Linux 18.104.22.168 and earlier version for Linux
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor.