On this May 2021 Patch Tuesday: Adobe has fixed a Reader flaw exploited in attacks in the wild, as well as delivered security updates for eleven other products. Microsoft has plugged 55 security holes, none actively exploited by attackers. SAP has released 14 new and updated security patches; Adobe has released a total of 44. The updates that should be prioritized are those for Adobe Acrobat and Reader for Windows and MacOS, as they fix a number of critical and important vulnerabilities in a widely used product that has often been targeted by attackers.
Source: https://www.helpnetsecurity.com/2021/05/12/may-2021-patch-tuesday/