| Version | Release Date | Key Fixes | | :--- | :--- | :--- | | | Oct 2017 | Final patch (APSB17-36): 34 critical vulnerabilities (heap overflow, use-after-free). | | 11.0.22 | Aug 2017 | Backported fixes for CVE-2017-11237, CVE-2017-3085 (Type confusion). | | 11.0.21 | Jul 2017 | Critical: Arbitrary code execution via crafted JPEG 2000 images. | | 11.0.20 | May 2017 | Mitigated CVE-2017-3068 (Lead to sandbox escape in Reader XI). |

It has a smaller footprint and faster launch times on older computers compared to the modern DC version. How to "Update"

Every day you continue using it, you expose yourself, your data, and your network to preventable exploits. The legitimate "update" you seek is not a patch—it is a migration. Uninstall Adobe Reader XI today and replace it with either:

If you are currently running an older minor version of Reader XI (e.g., 11.0.10) and want to reach the final available patch (11.0.23), you can do so manually or through the application: In-App Update: Open Adobe Reader XI and navigate to Help > Check for Updates

The official successor, which is free and offers cloud storage and modern security.