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Improper Neutralization of CRLF Sequences ('CRLF Injection')

CVE-2025-67735

Medium
6.5/10

Summary

Netty is an asynchronous, event-driven network application framework. In versions prior to 4.1.129.Final and 4.2.x prior to 4.2.8.Final, the `io.netty.handler.codec.http.HttpRequestEncoder` has a CRLF injection with the request URI when constructing a request. This leads to request smuggling when `HttpRequestEncoder` is used without proper sanitization of the URI. Any application / framework using `HttpRequestEncoder` can be subject to be abused to perform request smuggling using CRLF injection. Versions 4.1.129.Final and 4.2.8.Final fix the issue.

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

CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')

The software uses CRLF (carriage return line feeds) as a special element, e.g. to separate lines or records, but it does not neutralize or incorrectly neutralizes CRLF sequences from inputs.

References

Advisory Timeline

  • Published