CVE-2021-30639

 

Published at: - 12-07-2021 05:15

Last modified: - 21-08-2022 07:15

Total changes: - 10

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.

Common Vulnerability Scoring System (CVSS)

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

 

Verification logic

 

Reference

• https://lists.apache.org/thread.html/rd84fae1f474597bdf358f5bdc0a5c453c507bd527b83e8be6b5ea3f4%40%3Cannounce.tomcat.apache.org%3E
• [tomcat-users] 20210712 RE: [SECURITY] CVE-2021-30639 Apache Tomcat DoS-Mailing List, Vendor Advisory
• [tomcat-dev] 20210712 RE: [SECURITY] CVE-2021-30639 Apache Tomcat DoS-Mailing List, Vendor Advisory
• https://security.netapp.com/advisory/ntap-20210827-0007/
• https://kc.mcafee.com/corporate/index?page=content&id=SB10366
• https://www.oracle.com/security-alerts/cpujan2022.html
• GLSA-202208-34-

 

Keywords

NVD

 

CVE-2021-30639

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures