REDHAT-BUG-2539486: High severity Apache Tomcat vulnerability
Allocation of resources without limits or throttling vulnerability in Apache Tomcat allows an unauthenticated AJP request to pin an AJP processing thread leading to denial of service.
This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.25, from 10.1.0-M1 through 10.1.59, from 9.0.0.M1 through 9.0.121.
The following versions were EOL at the time the CVE was created but are known to be affected: from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109. 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
Which deployments are exposed to this denial-of-service issue?
Deployments running an affected Apache Tomcat version with AJP requests reachable by an unauthenticated attacker are exposed. The issue can allow each such request to pin an AJP processing thread.
What does an attacker need to exploit the issue?
An attacker only needs to send an unauthenticated AJP request. No authentication requirement is described.
Which versions contain the fix?
Upgrade to Apache Tomcat 11.0.26, 10.1.60, or 9.0.122. These versions fix the issue.
Are end-of-life Tomcat releases affected?
Known affected end-of-life releases include 8.5.0 through 8.5.100 and 7.0.0 through 7.0.109. Other unsupported versions may also be affected.