CVE-2025-61795: Apache Tomcat DoS via delayed cleanup of multipart temporary files

CVE-2025-61795 · Severity: medium · CVSS 5.3 · Published 2025-10-27

Apache Tomcat, a widely used web server for Java applications, contains a flaw in how it handles file uploads. When an error occurs during a large file upload, the server may fail to immediately delete temporary files, potentially filling up the server's storage space. This can lead to a denial-of-service (DoS) condition, making the web application unavailable to legitimate users.

Technologies: Apache Tomcat, org.apache.tomcat:tomcat (Maven), org.apache.tomcat:tomcat-catalina (Maven), org.apache.tomcat.embed:tomcat-embed-core (Maven), Siemens SIMATIC CN 4100. Vendors: Apache, Maven, Siemens.

Quick answers

Is CVE-2025-61795 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2025-61795 being exploited in the wild.
How severe is CVE-2025-61795?
Medium severity, with a CVSS score of 5.3, published 27 October 2025.
Which products and versions are affected?
Apache Tomcat 11.0.0-M1 through 11.0.11, 10.1.0-M1 through 10.1.46, 9.0.0.M1 through 9.0.109, 8.5.0 through 8.5.100; org.apache.tomcat:tomcat (Maven) ECOSYSTEM:introduced=11.0.0-M1,fixed=11.0.12; org.apache.tomcat:tomcat-catalina (Maven) ECOSYSTEM:introduced=11.0.0-M1,fixed=11.0.12; org.apache.tomcat.embed:tomcat-embed-core (Maven) ECOSYSTEM:introduced=11.0.0-M1,fixed=11.0.12; and 1 more.
Is there a fix for CVE-2025-61795?
Yes. org.apache.tomcat:tomcat (Maven): upgrade to 11.0.12 or later; org.apache.tomcat:tomcat-catalina (Maven): upgrade to 11.0.12 or later; org.apache.tomcat.embed:tomcat-embed-core (Maven): upgrade to 11.0.12 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2025-61795 attacked?
It is attacked over the network, in a software library.
Am I affected by CVE-2025-61795?
Check whether you run Apache Tomcat, org.apache.tomcat:tomcat (Maven), org.apache.tomcat:tomcat-catalina (Maven) or one of the others listed 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 (Maven): upgrade to 11.0.12 or later
    # set org.apache.tomcat:tomcat to 11.0.12 in your pom.xml or build.gradle
  • org.apache.tomcat:tomcat-catalina (Maven): upgrade to 11.0.12 or later
    # set org.apache.tomcat:tomcat-catalina to 11.0.12 in your pom.xml or build.gradle
  • org.apache.tomcat.embed:tomcat-embed-core (Maven): upgrade to 11.0.12 or later
    # set org.apache.tomcat.embed:tomcat-embed-core to 11.0.12 in your pom.xml or build.gradle

Technical details

A vulnerability classified as Improper Resource Shutdown or Release (CWE-404) exists in Apache Tomcat's multipart upload handling. When an error occurs—such as exceeding file size limits—temporary file copies written to disk are not immediately deleted, instead relying on the JVM garbage collection process for cleanup. An attacker with low privileges can repeatedly trigger these errors to fill the server's disk space faster than the GC can reclaim it, resulting in a Denial of Service (DoS). The issue is present in versions 11.0.0-M1 through 11.0.11, 10.1.0-M1 through 10.1.46, 9.0.0.M1 through 9.0.109, and 8.5.x. Patches are available in versions 11.0.12, 10.1.47, and 9.0.110.

Affected products

  • Apache Tomcat 11.0.0-M1 to 11.0.11, 10.1.0-M1 to 10.1.46, 9.0.0.M1 to 9.0.109, 8.5.0 to 8.5.100

Identifiers

  • CVE-2025-61795
  • GHSA-hgrr-935x-pq79

Timeline

  • 2025-10-27: disclosed
  • 2025-10-27: advisory

References

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