Adobe has released Patch Tuesday updates for the month of May with fixes for multiple vulnerabilities spanning 12 different products, including a zero-day flaw affecting Adobe Reader that's actively exploited in the wild. CVE-2021-28550 is a zero-day concerns an arbitrary code execution flaw that could allow adversaries to execute virtually any command on target systems.

https://helpx.adobe.com/security/products/acrobat/apsb21-29.html