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Invallid packet crashes the UT4 game server

Recently we’ve had crashes with our UT4 server. The hub it self stays active, but the spawned game ‘room’ or ‘server’ crashes.
I have no option to reproduce this behavior.

This might be related to this topic: https://forums.unrealengine.com/unreal-engine/feedback-for-epic/73295-urgent-game-server-ddos/
If this is really related to that topic, it could either be that the UT4 is still using the old borked UE4, or the problem isn’t fixed properly.

Please can someone look into this?

Lambik

PS:
[Log file]
[2018.12.12-19.53.16:174][262]LogRep:Warning: FRepLayout::ReplicatePropertiesUsingChangelistState: Entire history sent for: DefaultCharacter_C
[2018.12.12-19.53.16:224][265]LogRep:Warning: FRepLayout::ReplicatePropertiesUsingChangelistState: Entire history sent for: DefaultCharacter_C
[2018.12.12-19.53.16:257][267]LogRep:Warning: FRepLayout::ReplicatePropertiesUsingChangelistState: Entire history sent for: DefaultCharacter_C
2018.12.12-19.56.42:948][501]LogNetSerialization:Error: FBitReader::SetOverflowed() called! (ReadLen: 549, Remaining: 411, Max: 458)
[2018.12.12-19.56.42:948][501]LogSecurity:Warning: 94.1.115.220:54669: Invalid_Data: Bunch data overflowed (15 47+549/458)
[2018.12.12-19.56.42:948][501]LogSecurity:Warning: 94.1.115.220:54669: Closed: Connection closed
[2018.12.12-19.56.45:127][631]LogGenericPlatformMisc: FPlatformMisc::RequestExit(0)
[2018.12.12-19.56.45:127][632]LogExit: GameNetDriver IpNetDriver_12 shut down
[2018.12.12-19.56.45:127][632]LogExit: IpNetDriver_14 IpNetDriver_14 shut down
[2018.12.12-19.56.45:128][632]LogExit: IpNetDriver_13 IpNetDriver_13 shut down
[2018.12.12-19.56.45:152][632]LogExit: Preparing to exit.
[2018.12.12-19.56.45:252][632]LogExit: Game engine shut down
[2018.12.12-19.56.45:319][632]LogObj: Freed 32b from 1 cluster array pools.
[2018.12.12-19.56.45:319][632]LogExit: Object subsystem successfully closed.
[2018.12.12-19.56.45:839][632]LogExit: Exiting.
Exiting abnormally (error code: 143)