REDHAT-BUG-2539396: High severity Apache Tomcat vulnerability
Uncontrolled Resource Consumption vulnerability in Apache Tomcat during sending of WebSocket close message enabled a DoS attack.
This issue affects Apache Tomcat: from 11.0.0-M5 through 11.0.25, from 10.1.8 through 10.1.59, from 9.0.74 through 9.0.121.
The following versions were EOL at the time the CVE was created but are known to be affected: from 8.5.88 through 8.5.100. Other unsupported versions may also be affected.
Users are recommended to upgrade to version 11.0.26, 10.1.60 or 9.0.122, which fix the issue.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Apache Tomcatto a version that resolves this vulnerability.Fixed in 11.0.26 - Upgrade
Upgrade
Apache Tomcatto a version that resolves this vulnerability.Fixed in 10.1.60 - Upgrade
Upgrade
Apache Tomcatto a version that resolves this vulnerability.Fixed in 9.0.122
Event History
Frequently Asked Questions
What does an attacker need to do to trigger the denial of service?
The issue is triggered during the sending of a WebSocket close message. The provided information does not state any authentication or other access prerequisites.
Which Tomcat release lines have a fixed version available?
Upgrade to Apache Tomcat 11.0.26, 10.1.60, or 9.0.122. These releases fix the uncontrolled resource consumption issue.
Are end-of-life Tomcat versions affected?
Tomcat 8.5.88 through 8.5.100 were end-of-life when the CVE was created and are known to be affected. Other unsupported versions may also be affected.