CVE-2025-29908: Netty incubator codec quic Denial of Service Vulnerability

MODERATE
Advisory Identifier: GHSA-hqqc-jr88-p6x2
Share
CVSS 5.3
CWE-407
Published
Advisory Summary

CVE-2025-29908 is a MODERATE (CVSS 5.3) denial of service vulnerability (CWE-407: Inefficient Algorithmic Complexity) affecting Netty incubator codec quic libraries in the Maven ecosystem. The issue involves netty quic hash collision dos attack. Remediation is available by upgrading affected packages to version 0.0.71.Final.

CVE-2025-29908 at a Glance

CVE Identifier CVE-2025-29908
GHSA Identifier GHSA-hqqc-jr88-p6x2
Severity MODERATE
CVSS v3.1 Base Score 5.3
CWE Classification CWE-407: Inefficient Algorithmic Complexity
Affected Product Netty incubator codec quic
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 5.3

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity None (I:N)
Availability Low (A:L)

How to Fix CVE-2025-29908

To remediate this vulnerability, upgrade all affected Netty incubator codec quic dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

io.netty.incubator:netty-incubator-codec-quic fixed: 0.0.71.Final 
<dependency>
    <groupId>io.netty.incubator</groupId>
    <artifactId>netty-incubator-codec-quic</artifactId>
    <version>0.0.71.Final</version>
</dependency>
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree -Dincludes=io.netty.incubator

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2025-29908, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=io.netty.incubator

Analyze the terminal output to locate any version of Netty incubator codec quic in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.0.71.Final), your application is affected.

Note: The mvn dependency:tree -Dincludes=io.netty.incubator command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-407: Inefficient Algorithmic Complexity, where an algorithm in a product has an inefficient worst-case computational complexity that may be detrimental to system performance and can be triggered by an attacker, typically using crafted manipulations that ensure that the worst case is being reached. In Netty incubator codec quic, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

An issue was discovered in the codec. A hash collision vulnerability (in the hash map used to manage connections) allows remote attackers to cause a considerable CPU load on the server (a Hash DoS attack) by initiating connections with colliding Source Connection IDs (SCIDs). See https://github.com/ncc-pbottine/QUIC-Hash-Dos-Advisory

CVE-2025-29908 Affected Netty incubator codec quic Versions

1 component(s)
Fixed Versions:
0.0.71.Final
Product / Package Ecosystem Affected Versions Fixed Version
io.netty.incubator:netty-incubator-codec-quic
maven/io.netty.incubator/netty-incubator-codec-quic
Maven
< 0.0.71.Final
0.0.71.Final

References

GitHub Advisory / Wiki ADVISORY
https://github.com/netty/netty-incubator-codec-quic/security/advisories/GHSA-hqqc-jr88-p6x2
NVD — CVE-2025-29908 NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-29908
Security Fix Commit FIX COMMIT
https://github.com/netty/netty-incubator-codec-quic/commit/e059bd9b78723f8b035e0c547e42ce263f03461c
Netty incubator codec quic Source Repository REPOSITORY
https://github.com/ncc-pbottine/QUIC-Hash-Dos-Advisory
Netty incubator codec quic Source Repository REPOSITORY
https://github.com/netty/netty-incubator-codec-quic

Frequently Asked Questions

What is CVE-2025-29908?
CVE-2025-29908 is a security vulnerability in Netty incubator codec quic involving Netty QUIC hash collision DoS attack under CWE-407: Inefficient Algorithmic Complexity.
Which Netty incubator codec quic versions are affected?
Affected versions include releases prior to 0.0.71.Final across affected packages: io.netty.incubator:netty-incubator-codec-quic.
What version fixes CVE-2025-29908?
Upgrading to 0.0.71.Final (or the latest patched release for your respective branch) resolves the vulnerability.
Is netty-incubator-codec-quic affected?
Yes, io.netty.incubator:netty-incubator-codec-quic is affected in releases prior to 0.0.71.Final. Upgrade your dependency to 0.0.71.Final or later.
What is the CVSS score of CVE-2025-29908?
CVE-2025-29908 has a CVSS v3.1 base score of 5.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.
What CWE is associated with CVE-2025-29908?
CVE-2025-29908 is classified under CWE-407: Inefficient Algorithmic Complexity (An algorithm in a product has an inefficient worst-case computational complexity that may be detrimental to system performance and can be triggered by an attacker, typically using crafted manipulations that ensure that the worst case is being reached.).
How can I check Maven dependencies for CVE-2025-29908?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=io.netty.incubator'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-hqqc-jr88-p6x2",
  "modified" : "2025-03-31T21:47:21Z",
  "published" : "2025-03-31T21:47:20Z",
  "aliases" : [ "CVE-2025-29908" ],
  "summary" : "Netty QUIC hash collision DoS attack",
  "details" : "An issue was discovered in the codec. A hash collision vulnerability (in the hash map used to manage connections) allows remote attackers to cause a considerable CPU load on the server (a Hash DoS attack) by initiating connections with colliding Source Connection IDs (SCIDs).\n\nSee https://github.com/ncc-pbottine/QUIC-Hash-Dos-Advisory",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "io.netty.incubator:netty-incubator-codec-quic"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.0.71.Final"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/netty/netty-incubator-codec-quic/security/advisories/GHSA-hqqc-jr88-p6x2"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-29908"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/netty/netty-incubator-codec-quic/commit/e059bd9b78723f8b035e0c547e42ce263f03461c"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/ncc-pbottine/QUIC-Hash-Dos-Advisory"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/netty/netty-incubator-codec-quic"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-407" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-03-31T21:47:20Z",
    "nvd_published_at" : "2025-03-31T19:15:40Z"
  }
}