Bug ID 561623: Realtime encryption causes high CPU usage in older browsers

Last Modified: May 29, 2024

Affected Product(s):
BIG-IP FPS(all modules)

Known Affected Versions:
11.5.1 HF1, 11.5.1 HF2, 11.5.1 HF3, 11.5.1 HF4, 11.5.1 HF5, 11.5.1 HF6, 11.5.1 HF7, 11.5.1 HF8, 11.5.1 HF9, 11.5.1 HF10, 11.5.1 HF11, 11.5.2 HF1, 11.5.3 HF1, 11.5.3 HF2, 11.5.4 HF1, 11.5.4 HF2, 11.5.4 HF3, 11.5.4 HF4

Fixed In:
11.6.1 HF1

Opened: Dec 06, 2015

Severity: 2-Critical


When encrypting using realtime encryption, CPU usage on the browser rises very high


In extreme cases, browser may prompt user to stop the encryption script.


Client: Internet Explorer 8 or below FPS: Configured to encrypt password using realtime encryption


Disable realtime encryption in your anti-fraud policy.

Fix Information

Improved performance of realtime encryption

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips