Adobe Reader Xi Version 11.0.23 | 2021

Adobe Reader XI (version 11.0.23) is the final release and last planned update for the Adobe Reader 11.x lifecycle. Released on November 14, 2017

• CVE-2018-4993 (a zero-day that allowed arbitrary code execution via a crafted PDF, patched only in DC but not in XI)
• CVE-2020-9715 (a cross-site scripting vulnerability in PDF email attachments)
• CVE-2021-44701 (an out-of-bounds write in the 3D rendering engine; XI lacks the 3D feature, but related code paths are still vulnerable)

Accessibility: Fixed an issue where images or text would disappear when using the Reading Order tool for figure captions. adobe reader xi version 11.0.23

Using 11.0.23 is like leaving your front door wide open. A single malicious PDF in your email can hijack your entire system. Adobe Reader XI (version 11

1. Disable JavaScript – Go to Edit > Preferences > JavaScript and uncheck “Enable JavaScript.” This blocks 70% of exploits.
2. Disable Enhanced Security – No—wait, opposite. Enable Enhanced Security: Edit > Preferences > Security (Enhanced) → Check “Enable Enhanced Security.”
3. Set Protected View to “All Files” – Open PDFs from any non-local source in read-only sandbox.
4. Block automatic updates – Since there are none, disable the update checks to avoid nag screens.
5. Use Software Restriction Policies – In Windows, block Adobe Reader from spawning child processes (e.g., cmd.exe, powershell.exe).
6. Run in an AppContainer – Use tools like Sandboxie or Windows built-in Windows Sandbox for every PDF opening.

Adobe Reader XI includes several accessibility features: Accessibility : Fixed an issue where images or

• 11 = Major version (Reader XI)
• 0 = Minor release track
• 23 = The 23rd cumulative update/patch

for migrating your documents to a more modern, supported version of Acrobat? End of support for Adobe Acrobat XI and Reader XI