CVE-2025-55668: Apache Tomcat session fixation in rewrite valve

CVE-2025-55668 · Severity: medium · CVSS 6.5 · Published 2025-08-13

Apache Tomcat is a widely used web server and application container for Java-based websites. A security flaw in its URL rewriting component could allow an attacker to hijack a user's session. If successful, this could lead to unauthorized access to sensitive user data or account takeover.

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

Quick answers

Is CVE-2025-55668 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2025-55668 being exploited in the wild.
How severe is CVE-2025-55668?
Medium severity, with a CVSS score of 6.5, published 13 August 2025.
Which products and versions are affected?
Apache Tomcat 9.0.0.M1 to 9.0.105, 10.1.0-M1 to 10.1.41, 11.0.0-M1 to 11.0.7; org.apache.tomcat:tomcat-catalina (Maven) ECOSYSTEM:introduced=11.0.0-M1,fixed=11.0.8; org.apache.tomcat.embed:tomcat-embed-core (Maven) ECOSYSTEM:introduced=11.0.0-M1,fixed=11.0.8.
Is there a fix for CVE-2025-55668?
Yes. org.apache.tomcat:tomcat-catalina (Maven): upgrade to 11.0.8 or later; org.apache.tomcat.embed:tomcat-embed-core (Maven): upgrade to 11.0.8 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2025-55668 attacked?
It is attacked over the network, in a software library.
Am I affected by CVE-2025-55668?
Check whether you run Apache Tomcat, org.apache.tomcat:tomcat-catalina (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-catalina (Maven): upgrade to 11.0.8 or later
    # set org.apache.tomcat:tomcat-catalina to 11.0.8 in your pom.xml or build.gradle
  • org.apache.tomcat.embed:tomcat-embed-core (Maven): upgrade to 11.0.8 or later
    # set org.apache.tomcat.embed:tomcat-embed-core to 11.0.8 in your pom.xml or build.gradle

Technical details

A session fixation vulnerability (CWE-384) exists in Apache Tomcat's rewrite valve component. The flaw allows an attacker to establish a known session identifier for a user, which Tomcat fails to properly invalidate or rotate during authentication or session establishment. This network-based attack requires minimal user interaction and can result in the compromise of session confidentiality. The issue is resolved in versions 9.0.106, 10.1.42, and 11.0.8.

Affected products

  • Apache Tomcat 9.0.0.M1 to 9.0.105, 10.1.0-M1 to 10.1.41, 11.0.0-M1 to 11.0.7

Identifiers

  • CVE-2025-55668
  • GHSA-23hv-mwm6-g8jf

Timeline

  • 2025-08-13: disclosed
  • 2025-08-13: advisory

References

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