CVE-2021-30639

Summary

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. This meant that once a non-blocking I/O error occurred, all future requests handled by that request object would fail. Users were able to trigger non-blocking I/O errors, e.g. by dropping a connection, thereby creating the possibility of triggering a DoS. Applications that do not use non-blocking I/O are not exposed to this vulnerability. This issue affects Apache Tomcat 10.0.3 to 10.0.4; 9.0.44; 8.5.64.

Affected Software

VendorProductVersion RangeStatus
Apache Software FoundationApache TomcatApache Tomcat 10 10.0.3 to 10.0.4affected
Apache Software FoundationApache TomcatApache Tomcat 9 9.0.44affected
Apache Software FoundationApache TomcatApache Tomcat 8.5 8.5.64affected

Weaknesses

  • Denial of Service

ADP Enrichment

CVE Program Container

Additional References

References