CVE-2025-55163

Netty is an asynchronous, event-driven network application framework. Prior to versions 4.1.124.Final and 4.2.4.Final, Netty is vulnerable to MadeYouReset DDoS. This is a logical vulnerability in the HTTP/2 protocol, that uses malformed HTTP/2 control frames in order to break the max concurrent streams limit - which results in resource exhaustion and distributed denial of service. This issue has been patched in versions 4.1.124.Final and 4.2.4.Final.

Published: Aug 13, 2025
Updated: Aug 20, 2025
CVE: CVE-2025-55163
GHSA: GHSA-prj3-ccx8-p6x4
Severity: High
Exploit:

CVSS v3:

Severity: Unknown
Score:
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWEs:

CWE-770

Affected Software
References

Software	From	Fixed in
io.netty / netty-codec-http2	4.2.0.Alpha1	4.2.4.Final
io.netty / netty-codec-http2	-	4.1.124.Final
io.grpc / grpc-netty-shaded	-	1.75.0

https://github.com/grpc/grpc-java/commit/6462ef9a11980e168c21d90bbc7245c728fd1a7a
https://github.com/netty/netty/commit/be53dc3c9acd9af2e20d0c3c07cd77115a594cf1
https://github.com/netty/netty/security/advisories/GHSA-prj3-ccx8-p6x4

Vulnerability Database

CVE-2025-55163

Deep Security Visibility Without the Complexity