CVE-2021-21409

MEDIUM

Netty < 4.1.61 - HTTP Request Smuggling via Single Http2HeaderFrame

Title source: llm
STIX 2.1

Description

Netty is an open-source, asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients. In Netty (io.netty:netty-codec-http2) before version 4.1.61.Final there is a vulnerability that enables request smuggling. The content-length header is not correctly validated if the request only uses a single Http2HeaderFrame with the endStream set to to true. This could lead to request smuggling if the request is proxied to a remote peer and translated to HTTP/1.1. This is a followup of GHSA-wm47-8v5p-wjpj/CVE-2021-21295 which did miss to fix this one case. This was fixed as part of 4.1.61.Final.

References (59)

Core 59
Core References
Third Party Advisory vendor-advisory x_refsource_debian
https://www.debian.org/security/2021/dsa-4885
Patch, Third Party Advisory x_refsource_misc
https://www.oracle.com//security-alerts/cpujul2021.html
Third Party Advisory x_refsource_confirm
https://security.netapp.com/advisory/ntap-20210604-0003/
Patch, Third Party Advisory x_refsource_misc
https://www.oracle.com/security-alerts/cpuoct2021.html
Patch, Third Party Advisory x_refsource_misc
https://www.oracle.com/security-alerts/cpujan2022.html
Patch, Third Party Advisory x_refsource_misc
https://www.oracle.com/security-alerts/cpuapr2022.html

Scores

CVSS v3 5.9
EPSS 0.0493
EPSS Percentile 91.0%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Details

CWE
CWE-444
Status published
Products (29)
debian/debian_linux 10.0
io.netty/netty 0Maven
io.netty/netty-codec-http2 4.0.0 - 4.1.61.FinalMaven
netapp/oncommand_api_services
netapp/oncommand_workflow_automation
netty/netty < 4.1.61
oracle/banking_corporate_lending_process_management 14.2.0
oracle/banking_corporate_lending_process_management 14.3.0
oracle/banking_corporate_lending_process_management 14.5.0
oracle/banking_credit_facilities_process_management 14.2.0
... and 19 more
Published Mar 30, 2021
Tracked Since Feb 18, 2026