5.3

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2025-29908

CVE-2025-29908: Netty QUIC hash collision DoS attack

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

(GitHub Advisory)

Miggo Vulnerability Database

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CVE-2025-29908

CVE-2025-29908:

5.3

CVSS Score

3.1

-

CVSS Score

Basic Information

Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
io.netty.incubator:netty-incubator-codec-quic	maven	< 0.0.71.Final	0.0.71.Final

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability stemmed from using a standard HashMap with ByteBuffer keys for connection management. The hash implementation for ByteBuffer was vulnerable to collision attacks. The patch replaces this with a SipHash-protected ConnectionIdChannelMap. Runtime detection would show:

The QuicheQuicCodec's connectionIdToChannel field operations
HashMap.put/get methods handling colliding keys
High CPU usage in HashMap collision resolution code paths Evidence from the patch shows direct replacement of HashMap with a secure alternative, confirming these were the vulnerable entry points.

Vulnerable functions

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WAF Protection Rules

WAF Rule

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Reasoning

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5.3

-

Basic Information

Basic Information

Concerned about an active attack path?

CVE-2025-29908: Netty QUIC hash collision DoS attack

CVE-2025-29908:

5.3

-

Basic Information

Basic Information

Technical Details

Technical Details

Vulnerability IntelligenceMiggo AI

Root Cause Analysis

Vulnerable functions

WAF Protection Rules

WAF Rule

Reasoning

Vulnerability IntelligenceMiggo AI

CVE-2025-29908: Netty QUIC hash collision DoS attack

Vulnerability IntelligenceMiggo AI

Root Cause Analysis

Vulnerable functions

WAF Protection Rules

WAF Rule

Reasoning

Basic Information

Basic Information

Technical Details

5.3

5.3

Vulnerability Intelligence
Miggo AI

Vulnerability Intelligence
Miggo AI

Vulnerability Intelligence
Miggo AI