CVE-2025-55163
netty - security update
7.5
HIGH
CVSS 3.1
EPSS 0.05%
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.
How to fix CVE-2025-55163
To remediate CVE-2025-55163, upgrade the affected package to a fixed version below.
- —upgrade to 1:4.1.48-4+deb11u3 or later
- —upgrade to 1:4.1.48-7+deb12u2 or later
- —upgrade to 1.75.0 or later
- —upgrade to 4.2.4.Final or later
Is CVE-2025-55163 being exploited?
Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.
Affected packages (4)
- from 0, < 1:4.1.48-4+deb11u3
- from 0, < 1:4.1.48-7+deb12u2
- from 0, < 1.75.0
- >= 4.2.0.Alpha1, < 4.2.4.Final
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | 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 |
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |