libnetty-java: Netty is an asynchronous event-driven network application framework forrapid development of maintainable high perform...
CVE-2021-43797 is fixed in 3 products on 1 platform, first by DEBIAN-CVE-2021-43797, released December 9, 2021. It is not reported as exploited. Patch Radar priority: Routine.
Netty is an asynchronous event-driven network application framework forrapid development of maintainable high performance protocol servers &clients. Netty prior to version 4.1.71.Final skips control chars when theyare present at the beginning / end of the header name. It should insteadfail fast as these are not allowed by the spec and could lead to HTTPrequest smuggling. Failing to do the validation might cause netty to"sanitize" header names before it forward these to another remote systemwhen used as proxy. This remote system can't see the invalid usage anymore,and therefore does not do the validation itself. Users should upgrade toversion 4.1.71.Final.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| libdb · rocky 8 | 0:5.3.28-42.el8_4 | RLSA-2022:5498 | Jul 5, 2022 |
| libnetty-java · Ubuntu 18.04.6 LTS (bionic) | 1:4.1.7-4ubuntu0.1+esm2 | libnetty-java 1:4.1.7-4ubuntu0.1+esm2 | Dec 12, 2022 |
| libnetty-java · Ubuntu 20.04 LTS (focal) | 1:4.1.45-1ubuntu0.1~esm1 | libnetty-java 1:4.1.45-1ubuntu0.1~esm1 | Dec 12, 2022 |
| libnetty-java · Ubuntu 22.04.1 LTS (jammy) | 1:4.1.48-4+deb11u1build0.22.04.1 | libnetty-java 1:4.1.48-4+deb11u1build0.22.04.1 | Dec 12, 2022 |
| libnetty-java · Ubuntu 24.10 (oracular) | 4.1.48-6 | libnetty-java 4.1.48-6 | Jan 16, 2026 |
| libnetty-java · Ubuntu 25.04 (plucky) | 4.1.48-6 | libnetty-java 4.1.48-6 | Jan 16, 2026 |
| netty · Debian 12.15 (bookworm) | 1:4.1.48-6 | DEBIAN-CVE-2021-43797 | Dec 9, 2021 |
| netty · Debian 13.5 (trixie) | 1:4.1.48-6 | DEBIAN-CVE-2021-43797 | Dec 9, 2021 |
| netty · Debian 14 | 1:4.1.48-6 | DEBIAN-CVE-2021-43797 | Dec 9, 2021 |
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