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Vulnerability record · CVE-2020-7238 · published 27 January 2020

CVE-2020-7238: Netty http request smuggling vulnerability

Netty · Netty

Netty 4.1.43.Final allows HTTP Request Smuggling because it mishandles Transfer-Encoding whitespace (such as a [space]Transfer-Encoding:chunked line) and a later Content-Length header. This issue exists because of an incomplete fix for CVE-2019-16869.

7.5 CVSS 3.1 High EPSS 3.6% · top 10.7% CWE-444 · HTTP request smuggling
7.5CVSS 3.1 base score, v2 5.0
3.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
6Affected product versions listed by NVD
36References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

Netty 4.1.43.Final allows HTTP Request Smuggling because it mishandles Transfer-Encoding whitespace (such as a [space]Transfer-Encoding:chunked line) and a later Content-Length header. This issue exists because of an incomplete fix for CVE-2019-16869.

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

Affected products

6 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://access.redhat.com/errata/RHSA-2020:0497 Third Party Advisory
https://access.redhat.com/errata/RHSA-2020:0567 Third Party Advisory
https://access.redhat.com/errata/RHSA-2020:0601 Third Party Advisory
https://access.redhat.com/errata/RHSA-2020:0605 Third Party Advisory
https://access.redhat.com/errata/RHSA-2020:0606 Third Party Advisory
https://access.redhat.com/errata/RHSA-2020:0804 Third Party Advisory
https://access.redhat.com/errata/RHSA-2020:0805 Third Party Advisory
https://access.redhat.com/errata/RHSA-2020:0806 Third Party Advisory
https://access.redhat.com/errata/RHSA-2020:0811 Third Party Advisory
https://github.com/jdordonezn/CVE-2020-72381/issues/1 ExploitThird Party Advisory
https://lists.apache.org/thread.html/r131e572d003914843552fa45c4398b9903fb74144986e8b107c0a3a7%40%3Ccommits.cassandra.ap
https://lists.apache.org/thread.html/rc8d554aad889d12b140d9fd7d2d6fc2e8716e9792f6f4e4b2cdc2d05%40%3Ccommits.cassandra.ap
https://lists.debian.org/debian-lts-announce/2020/02/msg00017.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2020/02/msg00018.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2020/09/msg00003.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TS6VX7OMXPDJIU5LRGUAHRK
https://netty.io/news/ Vendor Advisory
https://www.debian.org/security/2021/dsa-4885 Third Party Advisory
https://access.redhat.com/errata/RHSA-2020:0497 Third Party Advisory
https://access.redhat.com/errata/RHSA-2020:0567 Third Party Advisory
https://access.redhat.com/errata/RHSA-2020:0601 Third Party Advisory
https://access.redhat.com/errata/RHSA-2020:0605 Third Party Advisory
https://access.redhat.com/errata/RHSA-2020:0606 Third Party Advisory
https://access.redhat.com/errata/RHSA-2020:0804 Third Party Advisory
https://access.redhat.com/errata/RHSA-2020:0805 Third Party Advisory
https://access.redhat.com/errata/RHSA-2020:0806 Third Party Advisory
https://access.redhat.com/errata/RHSA-2020:0811 Third Party Advisory
https://github.com/jdordonezn/CVE-2020-72381/issues/1 ExploitThird Party Advisory
https://lists.apache.org/thread.html/r131e572d003914843552fa45c4398b9903fb74144986e8b107c0a3a7%40%3Ccommits.cassandra.ap
https://lists.apache.org/thread.html/rc8d554aad889d12b140d9fd7d2d6fc2e8716e9792f6f4e4b2cdc2d05%40%3Ccommits.cassandra.ap
https://lists.debian.org/debian-lts-announce/2020/02/msg00017.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2020/02/msg00018.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2020/09/msg00003.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TS6VX7OMXPDJIU5LRGUAHRK
https://netty.io/news/ Vendor Advisory
https://www.debian.org/security/2021/dsa-4885 Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2020-7238), CISA KEV, FIRST EPSS (scores of 2026-10-07). This page is refreshed as NVD updates the record.