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BurpSuite 2020 5 - Error : Improperly specified VM option 'MaxRAMPercentage=50.0'

Carlos | Last updated: Jun 08, 2020 07:46AM UTC

Hi, Afer upgrade to BurpSuite 2020 5 we receive this error: BurpSuite 2020 5 - Error : Improperly specified VM option 'MaxRAMPercentage=50.0'

Marcin | Last updated: Jun 08, 2020 08:39AM UTC

I got into same issue after this update. Workaround for now - run burpsuite_pro.jar from your Burp dir manually: java -jar burpsuite_pro.jar

Dakyne | Last updated: Jun 08, 2020 09:06AM UTC

I found a solution that seems to work properly : In BurpSuitePro.vmoptions Replace -XX:MaxRAMPercentage=50.0 With -XX:MaxRAMPercentage=50

Nicolas | Last updated: Jun 08, 2020 09:07AM UTC

Hello, A workaround I used was to edit the file /home/user/BurpSuitePro/BurpSuitePro.vmoptions - change line "-XX:MaxRAMPercentage=50.0" to "-XX:MaxRAMPercentage=50"

Uthman, PortSwigger Agent | Last updated: Jun 08, 2020 09:17AM UTC

Can you all please send us further information and diagnostics to support@portswigger.net, please? Diagnostics can be found at Help > Diagnostics. What OS is running on your machine?

Uthman, PortSwigger Agent | Last updated: Jun 08, 2020 12:09PM UTC

If you are seeing -Xmx and -XX:MaxRAMPercentage in your VMOPTIONS file, please try commenting out one of the two. They are both doing the same thing (specifying the maximum heap size). If you still encounter issues, please email us with further details.

W | Last updated: Jun 14, 2020 02:04PM UTC

Hi. I just upgraded from 2020.4.1 to 2020.5. I using Linux OS. Seeing issue. Previous version asked for update. Choosen to download Linux one .sh file bundled with binary. Run and exited successfully. After upgrade BurpSuitePro.vmoptions contains two lines (uncommented): -Xmx3967m -XX:MaxRAMPercentage=50.0 $ /opt/BurpSuitePro/BurpSuitePro Improperly specified VM option 'MaxRAMPercentage=50.0' Error: Could not create the Java Virtual Machine. Error: A fatal exception has occurred. Program will exit. After applying specified workaround [ changing option value from 50.0 to 50 ] Burp starting. Uthman, as you described there is no possibility to access Help > Diagnostics, because it is invalid tip (Burp not start at all). Please forward this to support not for helping us (who get here) but ppl who still not updated Burp to latest release. Kind regards.

Uthman, PortSwigger Agent | Last updated: Jun 15, 2020 08:34AM UTC