[CRITICAL] Server Performance Exploit

Summary

A reproducible technique that causes severe server-wide degradation in UEFN maps have been discovered. Due to the nature and severity of this issue, I am not comfortable sharing reproduction steps publicly.

Impact:

  • Affects all players on the server (not just the person doing it)
  • 100% reproducible
  • No third-party tools required
  • Scales in severity with more players involved
  • Potential for server instability with prolonged execution
  • MAYBE could affect Fortnite BR too (totally unsure about this one)

I’d prefer to enter in private contact with an Epic employee to share full reproduction steps.

Attached, a video of the exploit but from a player that’s randomly playing the game perspective

Please select what you are reporting on:

Unreal Editor for Fortnite

What Type of Bug are you experiencing?

Stability

Steps to Reproduce

Not giving it publicly in order to prevent players from abusing it.

Expected Result

The servers stay stable.

Observed Result

The servers become completely unstable.

Platform(s)

All

Video

Additional Notes

No third party software needed, this can be done only by launching the Fortnite client and then doing something precise.

FORT-1060495 has been created and its status is ‘Unconfirmed’. This is now in a queue to be reproduced and confirmed.