CVE-2021-30639

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.

Risk Information

Base Score

7.5

MODERATE

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Score

Exploitation Probability

0.422

Associated Vulnerability

Vulnerability	OS Platform
Vulnerabilities CVE-2021-30639 are fixed in 6 April 2021 Fixed in Apache Tomcat 10.0.5	Windows
Vulnerabilities CVE-2021-30639 are fixed in 6 April 2021 Fixed in Apache Tomcat 9.0.45	Windows
Vulnerabilities CVE-2021-30639 are fixed in 6 April 2021 Fixed in Apache Tomcat 8.5.65	Windows
Vulnerabilities CVE-2021-30640,CVE-2021-30639 are fixed in Apache - tomcat 10.0.5	Windows
Vulnerabilities CVE-2021-30640,CVE-2021-30639 are fixed in Apache - tomcat 9.0.45	Windows
Vulnerabilities CVE-2021-30640,CVE-2021-30639 are fixed in Apache - tomcat 8.5.65	Windows
Vulnerabilities CVE-2021-30639 are fixed in 6 April 2021 Fixed in Apache Tomcat 10.0.5 (For Linux)	Linux
Vulnerabilities CVE-2021-30639 are fixed in 6 April 2021 Fixed in Apache Tomcat 9.0.45 (For Linux)	Linux
Vulnerabilities CVE-2021-30639 are fixed in 6 April 2021 Fixed in Apache Tomcat 8.5.65 (For Linux)	Linux
Vulnerabilities CVE-2021-30640,CVE-2021-30639 are fixed in Apache - tomcat for Linux 10.0.5	Linux
Vulnerabilities CVE-2021-30640,CVE-2021-30639 are fixed in Apache - tomcat for Linux 9.0.45	Linux
Vulnerabilities CVE-2021-30640,CVE-2021-30639 are fixed in Apache - tomcat for Linux 8.5.65	Linux
Improper Handling of Exceptional Conditions Vulnerability (CVE-2021-30639)	NCM

Patch Details

No records found

References

https://nvd.nist.gov/vuln/detail/CVE-2023-1234
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-1234