CVE-2025-29908: netty netty-incubator-codec-quic Inefficient Algorithmic Complexity

Vulnerability summary

CVE-2025-29908 is a medium (CVSS 5.3) Inefficient Algorithmic Complexity vulnerability in netty netty-incubator-codec-quic. EPSS estimates a 0.58% chance of exploitation in the next 30 days, higher than 46.5% of scored vulnerabilities.

Timeline

1. 31-03-2025
   PublishedVulnerability first disclosed.
2. 01-04-2025
   Last modifiedVulnerability information updated.

Description

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.

• CWE-407Inefficient Algorithmic ComplexityAn 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.