CVE-2021-21295: Possible request smuggling in HTTP/2 due missing validation

CVE-2021-21295 · Severity: low · CVSS 3.1 · Published 2021-03-09

Possible request smuggling in HTTP/2 due missing validation

Technologies: io.netty:netty (Maven), io.netty:netty-codec-http2 (Maven), org.jboss.netty:netty (Maven). Vendors: Maven.

Quick answers

Is CVE-2021-21295 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2021-21295 being exploited in the wild.
How severe is CVE-2021-21295?
Low severity, with a CVSS score of 3.1, published 9 March 2021.
Which products and versions are affected?
io.netty:netty (Maven) ECOSYSTEM:introduced=0; io.netty:netty-codec-http2 (Maven) ECOSYSTEM:introduced=4.0.0,fixed=4.1.60.Final; org.jboss.netty:netty (Maven) ECOSYSTEM:introduced=0.
Is there a fix for CVE-2021-21295?
Yes. io.netty:netty-codec-http2 (Maven): upgrade to 4.1.60.Final or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2021-21295?
Check whether you run io.netty:netty (Maven), io.netty:netty-codec-http2 (Maven) or org.jboss.netty:netty (Maven) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • io.netty:netty-codec-http2 (Maven): upgrade to 4.1.60.Final or later
    # set io.netty:netty-codec-http2 to 4.1.60.Final in your pom.xml or build.gradle

Affected products

  • io.netty:netty (Maven) ECOSYSTEM:introduced=0
  • io.netty:netty-codec-http2 (Maven) ECOSYSTEM:introduced=4.0.0,fixed=4.1.60.Final
  • org.jboss.netty:netty (Maven) ECOSYSTEM:introduced=0

Identifiers

  • CVE-2021-21295
  • GHSA-wm47-8v5p-wjpj

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