This indicates an attack attempt to exploit a Buffer Overflow vulnerability in Adobe Flash Player.
The vulnerability is due to an error when the vulnerable software handles a maliciously crafted MP4 file. A remote attacker may be able to exploit this to execute arbitrary code within the context of the application, via a crafted MP4 file.
Adobe Flash Player Desktop Runtime 18.104.22.168 and earlier Windows and Macintosh
Adobe Flash Player Extended Support Release 22.214.171.124 and earlier Windows and Macintosh
Adobe Flash Player for Google Chrome 126.96.36.199 and earlier Windows, Macintosh, Linux and ChromeOS
Adobe Flash Player for Microsoft Edge and Internet Explorer 11 188.8.131.52 and earlier Windows 10
Adobe Flash Player for Internet Explorer 10 and 11 184.108.40.206 and earlier Windows 8.0 and 8.1
Adobe Flash Player for Linux 220.127.116.118 and earlier Linux
AIR Desktop Runtime 18.104.22.168 and earlier Windows and Macintosh
AIR SDK 22.214.171.124 and earlier Windows, Macintosh, Android and iOS
AIR SDK & Compiler 126.96.36.199 and earlier Windows, Macintosh, Android and iOS
AIR for Android 188.8.131.52 and earlier Android
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor.