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Apache Tomcat: Important: Denial of Service (CVE-2021-30639)

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Apache Tomcat: Important: Denial of Service (CVE-2021-30639)

Severity
5
CVSS
(AV:N/AC:L/Au:N/C:N/I:N/A:P)
Published
07/13/2021
Created
07/14/2021
Added
07/13/2021
Modified
07/26/2021

Description

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.

Solution(s)

  • apache-tomcat-upgrade-10_0_5
  • apache-tomcat-upgrade-8_5_65
  • apache-tomcat-upgrade-9_0_45

References

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