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HIGH

CVE-2020-7238

CVSS v3

7.5

HIGH

EPSS Score

3.6 %

exploit probability, as of 2026-10-19

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • io.netty:netty-handlerMavenfrom 4.1.43 · fixed in 4.1.45

Vendor advisories

  • CVE-2020-7238 Red Hat Product Security1,740 products fixed · 14 known affected

    netty: HTTP Request Smuggling due to Transfer-Encoding whitespace mishandling

    netty as a component of Red Hat BPM Suite 6 · netty-all.src as a component of Red Hat Enterprise MRG 3 · netty as a component of Red Hat JBoss A-MQ 6

  • RHSA-2024:10208 Red Hat Product Security26 products fixed

    Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 7.1.8 on RHEL 7 security update

  • RHSA-2020:4366 Red Hat Product Security1,251 products fixed

    Red Hat Security Advisory: Satellite 6.8 release

  • RHSA-2020:3197 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat Process Automation Manager 7.8.0 Security Update

  • RHSA-2020:3196 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat Decision Manager 7.8.0 Security Update

  • RHSA-2020:3192 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat Fuse 7.7.0 release and security update

16 more advisories

Full record on 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.

Technical details

Published
2020-01-27

Frequently asked questions

What is CVE-2020-7238?

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.

Is CVE-2020-7238 actively exploited?

Active exploitation of CVE-2020-7238 has not been confirmed. Its EPSS score was 3.6% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-7238?

CVE-2020-7238 has a CVSS v3 base score of 7.5 (HIGH severity).

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