Summary
Workarounds
Validation can be done by the user before proxy the request by validating the header.
Impact
The content-length header is not correctly validated if the request only use 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 https://github.com/netty/netty/security/advisories/GHSA-wm47-8v5p-wjpj which did miss to fix this one case.
CVE-2021-21409 has a CVSS score of 5.9 (Medium). The vector is network-reachable, no privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (4.1.61.Final); upgrading removes the vulnerable code path.
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
Remediation advice
This was fixed as part of 4.1.61.Final
Frequently Asked Questions
- What is CVE-2021-21409? CVE-2021-21409 is a medium-severity security vulnerability in io.netty:netty-codec-http2 (maven), affecting versions >= 4.0.0, < 4.1.61.Final. It is fixed in 4.1.61.Final.
- How severe is CVE-2021-21409? CVE-2021-21409 has a CVSS score of 5.9 (Medium). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
- Which packages are affected by CVE-2021-21409?
io.netty:netty-codec-http2(maven) (versions >= 4.0.0, < 4.1.61.Final)org.jboss.netty:netty(maven) (versions < 4.0.0)io.netty:netty(maven) (versions < 4.0.0)
- Is there a fix for CVE-2021-21409? Yes. CVE-2021-21409 is fixed in 4.1.61.Final. Upgrade to this version or later.
- Is CVE-2021-21409 exploitable, and should I be worried? Whether CVE-2021-21409 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
- What actually determines whether CVE-2021-21409 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
- How do I fix CVE-2021-21409? Upgrade
io.netty:netty-codec-http2to 4.1.61.Final or later.