CVE-2021-21409
What it is
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.
At a glance
- Exploitability
- Can be exploited over the network without logging in. High risk of data tampering.
- Exploit odds
- 4.9% chance of exploitation in the next 30 days (EPSS).
- Fix
- A patch, advisory or fixed version is referenced. Upgrade or apply it.
Timeline
- PublishedDisclosed publicly on CVE.org and NVD
- Last updatedMost recent change to the record
Why it ranks here
- Exploited in the wild: no, CISA does not list it.
- Exploit odds: 4.9% in the next 30 days (EPSS).
- Severity: 5.9 MEDIUM (CVSS).
- Fix: a patch or advisory is linked.
Details
- Published
- Last modified
- Exploit probability
- 4.9% · EPSS, next 30 days
- Weakness
- CWE-444
- Record status
- Modified
Affected
- Netty < 4.1.61
- Debian Linux 10.0
- Netapp Oncommand Api Services
- Netapp Oncommand Workflow Automation
- 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
Attack profile CVSS 3.1 · 5.9
- Attack vector
- Network
- Complexity
- High
- Privileges needed
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- High
- Availability
- None
Raw vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
Is it in your code?
Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.
Read https://cve-list.com/agent/cve/CVE-2021-21409.md and follow it. Check whether this project is affected by CVE-2021-21409. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.
Fix and advisories
- 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://www.oracle.com//security-alerts/cpujul2021.html
- https://www.oracle.com/security-alerts/cpuapr2022.html
- https://www.oracle.com/security-alerts/cpujan2022.html
- https://www.oracle.com/security-alerts/cpuoct2021.html
- 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
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
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