Uncontrolled Resource Consumption in Apache Tomcat Affects Performance
CVE-2025-53506

7.5HIGH

Key Information:

Vendor

Apache
Status
Apache Tomcat
Vendor
CVE Published:
10 July 2025

What is CVE-2025-53506?

An Uncontrolled Resource Consumption vulnerability exists in Apache Tomcat when an HTTP/2 client fails to acknowledge the initial settings frame, which is crucial in regulating the maximum number of permitted concurrent streams. This oversight can lead to excessive resource utilization, potentially degrading application performance and impacting overall system stability. It is advisable for users to upgrade to Apache Tomcat versions 11.0.9, 10.1.43, or 9.0.107 to mitigate the risks associated with this vulnerability.

Affected Version(s)

Apache Tomcat 11.0.0-M1 <= 11.0.8

Apache Tomcat 10.1.0-M1 <= 10.1.42

Apache Tomcat 9.0.0.M1 <= 9.0.106

References

https://lists.apache.org/thread/p09775q0rd185m6zz98krg0fp...
vendor-advisory

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Kanatoko
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CVE-2025-53506 : Uncontrolled Resource Consumption in Apache Tomcat Affects Performance