CVE-2025-67735

MEDIUM 6.5EPSS 0.3%

Netty is an asynchronous, event-driven network application framework. In versions prior to 4.1.129.Final and 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.

CVSS v3.1: 6.5 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
CVSS v3.1: 6.5 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
EPSS: 0.33% chance of exploitation in the next 30 days, 25th percentile
Published: 2025-12-16

Proof-of-concept exploits (1)

advisories/GHSA-84h7-rjj3-6jx4

References

CVE Record
NVD entry

CVE-2025-67735

Proof-of-concept exploits (1)

References

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