Adobe has released security updates for Adobe Reader DC, Adobe Acrobat DC, Adobe Reader XI, and Adobe Acrobat XI on Windows and Mac systems. The updates fix vulnerabilities that can lead to code execution and system compromise.
Acrobat and Reader DC (continuous track) should update to 15.023.20053
Acrobat and Reader DC (classic track) should update to 15.006.30279
Acrobat and Reader XI should update to 11.0.19
More information is available here: https://helpx.adobe.com/security/products/acrobat/apsb17-01.html