HTTP Request Smuggling

Affecting io.netty:netty-codec-http2 artifact, versions [,4.1.61.Final)

Report new vulnerabilities
Do your applications use this vulnerable package? Test your applications

Overview

io.netty:netty-codec-http2 is a HTTP2 sub package for the netty library, an event-driven asynchronous network application framework.

Affected versions of this package are vulnerable to HTTP Request Smuggling. The content-length header is not correctly validated if the request only uses a single Http2HeaderFrame with the endStream set 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 follow-up of CVE-2021-21295 which did not fix this specific case.

Remediation

Upgrade io.netty:netty-codec-http2 to version 4.1.61.Final or higher.

References

CVSS Score

5.9
medium severity
  • Attack Vector
    Network
  • Attack Complexity
    High
  • Privileges Required
    None
  • User Interaction
    None
  • Scope
    Unchanged
  • Confidentiality
    None
  • Integrity
    High
  • Availability
    None
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
Credit
Unknown
CVE
CVE-2021-21409
CWE
CWE-444
Snyk ID
SNYK-JAVA-IONETTY-1089809
Disclosed
31 Mar, 2021
Published
31 Mar, 2021