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Allocation of Resources Without Limits or Throttling in io.undertow:undertow-core

CVE-2025-9784

  • io.undertow:undertow-core
High
7.5/10

Summary

A flaw was found in Undertow versions through 2.2.37.Final and 2.3.x through 2.3.19.Final where malformed client requests can trigger server-side stream resets without triggering abuse counters. This issue, referred to as the "MadeYouReset" attack, allows malicious clients to induce excessive server workload by repeatedly causing server-side stream aborts. While not a protocol bug, this highlights a common implementation weakness that can be exploited to cause a Denial-of-Service (DoS).

  • LOW
  • NETWORK
  • NONE
  • UNCHANGED
  • NONE
  • NONE
  • NONE
  • HIGH

CWE-770 - Allocation of Resources Without Limits or Throttling

The software allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor.

References

Advisory Timeline

  • Published