tomcat-embed-core-9.0.44.jar vulnerability 

Issue date: 21-09-2021
Affects versions: 14.6

Security Issue ID

SECURITY-250

 

Affected Product Version(s)

14.6.0 and previous releases.

Severity 

medium

Description

 

CVE-2021-30639

 

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.

CWE-755 Improper Handling of Exceptional Conditions

CVSSv2:

• Base Score: MEDIUM (5.0)
• Vector: /AV:N/AC:L/Au:N/C:N/I:N/A

CVSSv3:

• Base Score: HIGH (7.5)
• Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Instructions

Customers using the 14.x major versions are recommended to upgrade to the latest version in that series.