CVE-2025-53506: Apache Tomcat Coyote vulnerable to Denial of Service via excessive HTTP/2 streams

CVE-2025-53506 · Severity: low · CVSS 3.1 · Published 2025-07-10

Apache Tomcat Coyote vulnerable to Denial of Service via excessive HTTP/2 streams

Technologies: org.apache.tomcat:tomcat-coyote (Maven), org.apache.tomcat.embed:tomcat-embed-core (Maven). Vendors: Maven.

Quick answers

Is CVE-2025-53506 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2025-53506 being exploited in the wild.
How severe is CVE-2025-53506?
Low severity, with a CVSS score of 3.1, published 10 July 2025.
Which products and versions are affected?
org.apache.tomcat:tomcat-coyote (Maven) ECOSYSTEM:introduced=11.0.0-M1,fixed=11.0.9; org.apache.tomcat.embed:tomcat-embed-core (Maven) ECOSYSTEM:introduced=8.5.0,last_affected=8.5.100.
Is there a fix for CVE-2025-53506?
Yes. org.apache.tomcat:tomcat-coyote (Maven): upgrade to 11.0.9 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2025-53506?
Check whether you run org.apache.tomcat:tomcat-coyote (Maven) or org.apache.tomcat.embed:tomcat-embed-core (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

  • org.apache.tomcat:tomcat-coyote (Maven): upgrade to 11.0.9 or later
    # set org.apache.tomcat:tomcat-coyote to 11.0.9 in your pom.xml or build.gradle

Affected products

  • org.apache.tomcat:tomcat-coyote (Maven) ECOSYSTEM:introduced=11.0.0-M1,fixed=11.0.9
  • org.apache.tomcat.embed:tomcat-embed-core (Maven) ECOSYSTEM:introduced=8.5.0,last_affected=8.5.100

Identifiers

  • CVE-2025-53506
  • GHSA-25xr-qj8w-c4vf

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.