Description
There exists a security vulnerability in Jetty's DosFilter which can be exploited by unauthorized

users to cause remote denial-of-service (DoS) attack on the server using DosFilter. By repeatedly sending crafted requests,

attackers can trigger OutofMemory errors and exhaust the server's memory finally.


Vulnerability details
The Jetty DoSFilter (Denial of Service Filter) is a security filter designed to protect web

applications against certain types of Denial of Service (DoS) attacks and other abusive behavior. It

helps to mitigate excessive resource consumption by limiting the rate at which clients can make

requests to the server.  The DoSFilter monitors and tracks client request patterns, including

request rates, and can take actions such as blocking or delaying requests from clients that exceed

predefined thresholds.  The internal tracking of requests in DoSFilter is the source of this OutOfMemory

condition.


Impact
Users of the DoSFilter may be subject to DoS attacks that 
will ultimately exhaust the memory of the server if they have not 
configured session passivation or an aggressive session inactivation 
timeout.


Patches
The DoSFilter has been patched in all active releases to no longer support the session tracking mode, even if configured.


Patched releases:



  *  9.4.54

  *  10.0.18

  *  11.0.18

  *  12.0.3

There exists a security vulnerability in Jetty's DosFilter which can be exploited by unauthorized users to cause remote denial-of-service (DoS) attack on the server using DosFilter. By repeatedly sending crafted requests, attackers can trigger OutofMemory errors and exhaust the server's memory finally.