CVE-2021-30639 vulnerability in Apache and Other Products
Published on July 12, 2021
DoS after non-blocking IO error
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.
Products Associated with CVE-2021-30639
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Affected Versions
Apache Software Foundation Apache Tomcat:- Version Apache Tomcat 10 10.0.3 to 10.0.4 is affected.
- Version Apache Tomcat 9 9.0.44 is affected.
- Version Apache Tomcat 8.5 8.5.64 is affected.
Exploit Probability
EPSS
0.42%
Percentile
61.60%
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.