CVE-2025-55163: Netty affected by MadeYouReset HTTP/2 DDoS vulnerability

CVE-2025-55163 · Severity: low · CVSS 3.1 · Published 2025-08-13

Netty affected by MadeYouReset HTTP/2 DDoS vulnerability

Technologies: io.netty:netty-codec-http2 (Maven). Vendors: Maven.

Quick answers

Is CVE-2025-55163 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2025-55163 being exploited in the wild.
How severe is CVE-2025-55163?
Low severity, with a CVSS score of 3.1, published 13 August 2025.
Which products and versions are affected?
io.grpc:grpc-netty-shaded (Maven) ECOSYSTEM:introduced=0,fixed=1.75.0; io.netty:netty-codec-http2 (Maven) ECOSYSTEM:introduced=4.2.0.Alpha1,fixed=4.2.4.Final.
Is there a fix for CVE-2025-55163?
Yes. io.grpc:grpc-netty-shaded (Maven): upgrade to 1.75.0 or later; io.netty:netty-codec-http2 (Maven): upgrade to 4.2.4.Final or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2025-55163?
Check whether you run io.grpc:grpc-netty-shaded (Maven) or io.netty:netty-codec-http2 (Maven) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • io.grpc:grpc-netty-shaded (Maven): upgrade to 1.75.0 or later
    # set io.grpc:grpc-netty-shaded to 1.75.0 in your pom.xml or build.gradle
  • io.netty:netty-codec-http2 (Maven): upgrade to 4.2.4.Final or later
    # set io.netty:netty-codec-http2 to 4.2.4.Final in your pom.xml or build.gradle

Affected products

  • io.grpc:grpc-netty-shaded (Maven) ECOSYSTEM:introduced=0,fixed=1.75.0
  • io.netty:netty-codec-http2 (Maven) ECOSYSTEM:introduced=4.2.0.Alpha1,fixed=4.2.4.Final

Identifiers

  • CVE-2025-55163
  • GHSA-prj3-ccx8-p6x4

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