On January 31, 2018, KrCERT/CC released a security alert regarding a vulnerability in Adobe Flash Player. Regarding this issue, Adobe Systems has also released a security advisory about the vulnerability (CVE-2018-4878). According to Adobe, the vulnerability is being exploited in the wild. As of February 6th, 2017 a patch from Adobe is available.

Recomendations:
Adobe has released a patch for this vulnerability, review its security bulletin [5] to choose the proper patch.
Also, since Adobe Flash is deprecated, you should consider migrating any still used Adobe Flashto HMTL5

https://helpx.adobe.com/security/products/flash-player/apsb18-03.html