CVE-2019-20444

9.1 CRITICAL 9% exploit odds Fix listed Other

What it is

HttpObjectDecoder.java in Netty before 4.1.44 allows an HTTP header that lacks a colon, which might be interpreted as a separate header with an incorrect syntax, or might be interpreted as an "invalid fold."

At a glance

Exploitability: Can be exploited over the network without logging in. High risk of data exposure, data tampering.
Exploit odds: 8.9% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2020-01-29 21:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-10-08 22:16 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 8.9% in the next 30 days (EPSS).
Severity: 9.1 CRITICAL (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2020-01-29 21:15 UTC
Last modified: 2026-10-08 22:16 UTC
Exploit probability: 8.9% · EPSS, next 30 days
Weakness: CWE-444
Record status: Modified

Affected

Netty < 4.1.44
Debian Linux 8.0
Debian Linux 9.0
Debian Linux 10.0
Fedoraproject Fedora 33
Canonical Ubuntu Linux 18.04
Redhat Jboss Amq Clients 2
Redhat Jboss Enterprise Application Platform 7.2

Attack profile CVSS 3.1 · 9.1

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: High
Availability: None

Raw vector

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

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2019-20444.md and follow it. Check whether this project is affected by CVE-2019-20444. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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Fix and advisories

References

NVD record · CVE.org record