CVE-2021-21409
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.
- CVSS 3.1
- 5.9
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N - EPSS
- 4.9% chance of exploitation in the next 30 days; higher than 92% of CVEs (scores of 2026-10-25)
- CWE
- CWE-444
- Published
- Modified
- Record from
- the NVD, synced
Affected
- debian:debian_linux
- netapp:oncommand_api_services
- netapp:oncommand_workflow_automation
- netty:netty
- oracle:banking_corporate_lending_process_management
- oracle:banking_credit_facilities_process_management
- oracle:banking_trade_finance_process_management
- oracle:coherence
- oracle:communications_brm_-_elastic_charging_engine
- oracle:communications_cloud_native_core_console
- oracle:communications_cloud_native_core_policy
- oracle:communications_design_studio
- oracle:communications_messaging_server
- oracle:helidon
- oracle:jd_edwards_enterpriseone_tools
- oracle:nosql_database
- oracle:primavera_gateway
- quarkus:quarkus
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-f256-j965-7f32 | Maven | io.netty:netty-codec-http2 | >=4.0.0 <4.1.61.Final | 4.1.61.Final |
| GHSA-f256-j965-7f32 | Maven | org.jboss.netty:netty | all versions | no fix published |
| GHSA-f256-j965-7f32 | Maven | io.netty:netty | all versions | no fix published |
References
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21295
- https://github.com/netty/netty/commit/b0fa4d5aab4215f3c22ce6123dd8dd5f38dc0432
- https://github.com/netty/netty/security/advisories/GHSA-f256-j965-7f32
- https://github.com/netty/netty/security/advisories/GHSA-wm47-8v5p-wjpj
- https://lists.apache.org/thread.html/r0b09f3e31e004fe583f677f7afa46bd30110904576c13c5ac818ac2c%40%3Cissues.flink.apache.org%3E