QID 730242

Date Published: 2021-11-04

QID 730242: Apache Tomcat Denial of Service (DoS) Vulnerability

Apache Tomcat is an open source web server and servlet container developed by the Apache Software Foundation.

A vulnerability in Apache Tomcat allows an attacker to remotely trigger a denial of service. An error introduced as part of a change to improve error handling during non-blocking I/O meant that the error flag associated with the Request object was not reset between requests.

Affected Versions:
Apache Tomcat 10.1.0-M1 to 10.1.0-M5
Apache Tomcat 10.0.0-M10 to 10.0.11
Apache Tomcat 9.0.40 to 9.0.53
Apache Tomcat 8.5.60 to 8.5.71

QID Detection Logic (Unauthenticated):
The QID checks for vulnerable version by sending a GET /QUALYS730242 HTTP/1.0 request which helps in retrieving the installed version of Apache Tomcat in the banner of the response.

Successful exploitation of the vulnerability can allow an attacker to trigger a DoS via an OutOfMemoryError.

  • CVSS V3 rated as High - 7.5 severity.
  • CVSS V2 rated as Medium - 5 severity.
    • Solution
    Upgrade to the Apache Tomcat 10.1.0-M6, 10.0.12, 9.0.54, 8.5.72 versions or to the latest version of Apache Tomcat. Please refer to Apache Tomcat Security Advisory.

    Vendor References

    CVEs related to QID 730242

    CVE-2021-42340 |
    Software Advisories
    Advisory ID Software Component Link
    CVE-2021-42340 URL Logo mail-archives.us.apache.org/mod_mbox/www-announce/202110.mbox/%3C9b8b83e3-7fec-a26d-7780-e5d4a85f7df6%40apache.org%3E
    By selecting these links, you may be leaving CVEreport webspace. We have provided these links to other websites because they may have information that would be of interest to you. No inferences should be drawn on account of other sites being referenced, or not, from this page. There may be other websites that are more appropriate for your purpose. CVEreport does not necessarily endorse the views expressed, or concur with the facts presented on these sites. Further, CVEreport does not endorse any commercial products that may be mentioned on these sites. Please address comments about any linked pages to [email protected].