CVE-2025-55163

Publication date 13 August 2025

Last updated 26 August 2026

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

7.5 · High

Score breakdown

Description

Netty is an asynchronous, event-driven network application framework. Prior to versions 4.1.124.Final and 4.2.4.Final, Netty is vulnerable to MadeYouReset DDoS. This is a logical vulnerability in the HTTP/2 protocol, that uses malformed HTTP/2 control frames in order to break the max concurrent streams limit - which results in resource exhaustion and distributed denial of service. This issue has been patched in versions 4.1.124.Final and 4.2.4.Final.

Status

Package Ubuntu Release Status
netty 26.04 LTS resolute
Not affected
25.10 questing Ignored end of life, was needs-triage
25.04 plucky Ignored end of life, was needs-triage
24.04 LTS noble
Fixed 1:4.1.48-9ubuntu0.2
22.04 LTS jammy
Fixed 1:4.1.48-4+deb11u2ubuntu0.2
20.04 LTS focal
Fixed 1:4.1.45-1ubuntu0.1~esm7
18.04 LTS bionic
Fixed 1:4.1.7-4ubuntu0.1+esm7
16.04 LTS xenial
Fixed 1:4.0.34-1ubuntu0.1~esm5
14.04 LTS trusty Ignored changes too intrusive

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Severity score breakdown

CVSS version:

Base score 8.2 · High

Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Base score 7.5 · High

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

Related Ubuntu Security Notices (USN)

Other references

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