Bottom line: Android 17 drastically reduces the number of failed lock screen entry attempts from over 1800 to 20 to prevent automated brute-force attacks.
Google introduces strict rate limiting for PIN entries in Android 17: after 20 consecutive failed attempts, the device blocks further input and enforces longer lockout periods. This makes brute-force attacks on stolen or lost devices significantly more difficult.
Google is implementing stricter rate limiting for the lock screen in Android 17 than in any previous Android version. While older versions in practice allowed hundreds or, over long periods of time, up to 1800 attempts, Android 17 drastically reduces this window. Under the new system logic, input is blocked after exactly 20 consecutive failed attempts; any further attempt causes the device to refuse additional input and enforce longer lockout periods.
The rationale behind this tightening is to combat brute-force attacks on stolen or lost devices. Attackers use automated lists or personal data such as birth dates to gain unauthorized access. According to Mishaal Rahman, Google’s Manager for Android Community Engagement, attackers can achieve a significant success rate by entering PINs or passwords in order of decreasing frequency; additional knowledge about the victim increases this rate further.
To protect legitimate owners from accidental permanent lockouts, a feature introduced in Android 16 QPR2 remains active: the system recognizes when the same incorrect PIN is entered multiple times in a row and does not count these repeated identical entries against the error counter.
Additionally, Google optimizes the lock screen user interface during a temporary lockout. Instead of displaying seconds, the system will now show the remaining wait time directly in minutes. If a user has completely forgotten their credentials, the lock screen offers a recovery link through which affected users can initiate account recovery on a separate device.
Source: www.it-daily.net · Published 5 July 2026
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