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CVE-2025-53506

Uncontrolled Resource Consumption vulnerability in Apache Tomcat if an HTTP/2 client did not acknowledge the initial settings frame that reduces the maximum permitted concurrent streams. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.8, from 10.1.0-M1 through 10.1.42, from 9.0.0.M1 through 9.0.106. The following versions were EOL at the time the CVE was created but are known to be…

Severity
High 7.5
Published
10 Jul 2025
Last changed
17 Jun 2026
Added to UpHeron
21 Oct 2026
Sources
NVD

Affected software

SoftwareAffected versions
Apache TomcatServers and applications · cpe:a:apache:tomcat
  • From 9.0.0 up to 9.0.106
  • From 10.1.0 up to 10.1.42
  • From 11.0.0 up to 11.0.8

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2025-53506
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2025-53506