CVSS 4.0
8.2 highCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:NCVE-2025-55163
High (8.2) in netty netty. EPSS 1.1% chance of exploitation in the next 30 days. Fixed in io.netty:netty-codec-http2 4.1.124.Final, 4.2.4.Final.
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.
Severity
CVSS 3.1
7.5 highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H- EPSS
- 1.1% chance of exploitation in the next 30 days; higher than 65% of CVEs (scores of 2026-10-31)
- CWE
- CWE-770
- Published
- Modified
- Record from
- the NVD, synced
Affected
- netty:netty
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-prj3-ccx8-p6x4 | Maven | io.netty:netty-codec-http2 | >=4.2.0.Alpha1 <4.2.4.Final | 4.2.4.Final |
| GHSA-prj3-ccx8-p6x4 | Maven | io.netty:netty-codec-http2 | <4.1.124.Final | 4.1.124.Final |
| GHSA-prj3-ccx8-p6x4 | Maven | io.grpc:grpc-netty-shaded | <1.75.0 | 1.75.0 |