Netty QUIC Codec 0.0.70: Hash DoS via Colliding SCIDs
CVE-2025-29908 Published on March 31, 2025
Netty QUIC hash collision DoS attack
Netty QUIC codec is a QUIC codec for netty which makes use of quiche. 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). This vulnerability is fixed in 0.0.71.Final.
Vulnerability Analysis
CVE-2025-29908 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a small impact on availability.
Weakness Type
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.
Products Associated with CVE-2025-29908
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Affected Versions
netty-incubator-codec-quic Version < 0.0.71.Final is affected by CVE-2025-29908Vulnerable Packages
The following package name and versions may be associated with CVE-2025-29908
| Package Manager | Vulnerable Package | Versions | Fixed In |
|---|---|---|---|
| maven | io.netty.incubator:netty-incubator-codec-quic | < 0.0.71.Final | 0.0.71.Final |
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.