If you are in a region where it is available (or can find the APK), is the best option.
Even with the correct APK, Android 5.1 hardware is often underpowered (1-2GB RAM). Here is how to make Facebook usable: apk facebook android 5.1
| Vulnerability | Severity | Description | |---------------|----------|-------------| | | 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). | If you are in a region where it