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Servers and applications

CVE-2021-25122

When responding to new h2c connection requests, Apache Tomcat versions 10.0.0-M1 to 10.0.0, 9.0.0.M1 to 9.0.41 and 8.5.0 to 8.5.61 could duplicate request headers and a limited amount of request body from one request to another meaning user A and user B could both see the results of user A's request.

Severity
High 7.5
Published
1 Mar 2021
Last changed
8 Oct 2026
Added to UpHeron
21 Oct 2026
Sources
NVD

Affected software

SoftwareAffected versions
Apache TomcatServers and applications · cpe:a:apache:tomcat
  • Version 10.0.0-milestone10
  • Version 10.0.0-milestone9
  • Version 10.0.0-milestone8
  • Version 10.0.0-milestone7
All 36 release lines
  • From 8.5.0 up to 8.5.61
  • From 9.0.0 up to 9.0.41
  • Version 9.0.0-milestone1
  • Version 9.0.0-milestone2
  • Version 9.0.0-milestone3
  • Version 9.0.0-milestone4
  • Version 9.0.0-milestone5
  • Version 9.0.0-milestone10
  • Version 9.0.0-milestone11
  • Version 9.0.0-milestone12
  • Version 9.0.0-milestone13
  • Version 9.0.0-milestone14
  • Version 9.0.0-milestone15
  • Version 9.0.0-milestone16
  • Version 9.0.0-milestone17
  • Version 9.0.0-milestone18
  • Version 9.0.0-milestone19
  • Version 9.0.0-milestone20
  • Version 9.0.0-milestone21
  • Version 9.0.0-milestone22
  • Version 9.0.0-milestone23
  • Version 9.0.0-milestone24
  • Version 9.0.0-milestone25
  • Version 9.0.0-milestone26
  • Version 9.0.0-milestone27
  • Version 10.0.0
  • Version 10.0.0-milestone1
  • Version 10.0.0-milestone2
  • Version 10.0.0-milestone3
  • Version 10.0.0-milestone4
  • Version 10.0.0-milestone5
  • Version 10.0.0-milestone6
  • Version 10.0.0-milestone7
  • Version 10.0.0-milestone8
  • Version 10.0.0-milestone9
  • Version 10.0.0-milestone10

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2021-25122
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2021-25122