CVE-2025-55163
High
Description
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.
SeverityHigh
CVSS7.5
Exploit probability—
ProductNetty
PublishedAug 13, 2025
First seenAug 13, 2025
Weakness typeCWE-770Allocation of resources without limits
How to fix
Update
- netty netty4.1.124, 4.2.4 or later
- io.netty:netty-codec-http24.2.4.Final, 4.1.124.Final or later
- io.grpc:grpc-netty-shaded1.75.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| netty netty | v < 4.1.124, 4.2.0 ≤ v < 4.2.4 | 4.1.124, 4.2.4 |
| io.netty:netty-codec-http2Maven | 4.2.0.Alpha1 ≤ v < 4.2.4.Final, v < 4.1.124.Final | 4.2.4.Final, 4.1.124.Final |
| io.grpc:grpc-netty-shadedMaven | v < 1.75.0 | 1.75.0 |
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