HTTP Request Smuggling Affecting io.netty:netty-codec-http2 package, versions [,4.1.60.Final)


Severity

Recommended
0.0
medium
0
10

CVSS assessment made by Snyk's Security Team. Learn more

Threat Intelligence

Exploit Maturity
Mature
EPSS
15.24% (96th percentile)

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  • Snyk IDSNYK-JAVA-IONETTY-1083991
  • published10 Mar 2021
  • disclosed10 Mar 2021
  • creditUnknown

Introduced: 10 Mar 2021

CVE-2021-21295  (opens in a new tab)
CWE-444  (opens in a new tab)

How to fix?

Upgrade io.netty:netty-codec-http2 to version 4.1.60.Final or higher.

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. If a Content-Length header is present in the original HTTP/2 request, the field is not validated by Http2MultiplexHandler as it is propagated up.

An additional case of this vulnerability was fixed in 4.1.61.Final (CVE-2021-21409).

CVSS Scores

version 3.1