For Android 5.1 (Lollipop), the standard Facebook app is no longer officially supported, as current versions typically require Android 6.0 or higher. While you can still find legacy APK files that function on this version, the experience will likely be slow or limited by security vulnerabilities. Recommended Option: Facebook Lite
Performance metrics:
| Vulnerability | Severity | Description |
|---------------|----------|-------------|
| Missing security patches | Critical | No backported fixes for CVE-2023-28121 (account takeover via OAuth) or CVE-2024-13057 (WebView RCE). |
| Deprecated TLS | High | The app uses TLS 1.2 only. Modern Facebook servers prefer TLS 1.3, leading to occasional downgrade attacks. |
| Unpatched WebView | Critical | Android 5.1's System WebView (Chromium 49) contains known RCE vulnerabilities (CVE-2016-1663, etc.) that the Facebook WebView wrapper inherits. |
| Local data storage | Medium | App data stored in /data/data/com.facebook.katana/ is not encrypted by default on Android 5.1 (no native encryption support). | apk facebook android 5.1
Warning: Downloading APKs from random websites is risky (malware, spyware). Use reputable archives only: For Android 5
To run Facebook on a device running Android 5.1 (Lollipop), you must use older versions of the app or the "Lite" version, as the current standard Facebook app requires Android 6.0 or higher [24]. Recommended APK Options | | Deprecated TLS | High | The app uses TLS 1