Amazon Linux 2 Security Advisory: ALAS2TOMCAT9-2023-005
Advisory Released Date: 2023-09-25
Advisory Updated Date: 2025-09-23
The simplified implementation of blocking reads and writes introduced in Tomcat 10 and back-ported to Tomcat 9.0.47 onwards exposed a long standing (but extremely hard to trigger) concurrency bug in Apache Tomcat 10.1.0 to 10.1.0-M12, 10.0.0-M1 to 10.0.18, 9.0.0-M1 to 9.0.60 and 8.5.0 to 8.5.77 that could cause client connections to share an Http11Processor instance resulting in responses, or part responses, to be received by the wrong client. (CVE-2021-43980)
Affected Packages:
tomcat
Note:
This advisory is applicable to Amazon Linux 2 - Tomcat9 Extra. Visit this page to learn more about Amazon Linux 2 (AL2) Extras and this FAQ section for the difference between AL2 Core and AL2 Extras advisories.
Issue Correction:
Run yum update tomcat or yum update --advisory ALAS2TOMCAT9-2023-005 to update your system.
noarch:
tomcat-9.0.65-1.amzn2.0.2.noarch
tomcat-admin-webapps-9.0.65-1.amzn2.0.2.noarch
tomcat-docs-webapp-9.0.65-1.amzn2.0.2.noarch
tomcat-jsvc-9.0.65-1.amzn2.0.2.noarch
tomcat-jsp-2.3-api-9.0.65-1.amzn2.0.2.noarch
tomcat-lib-9.0.65-1.amzn2.0.2.noarch
tomcat-servlet-4.0-api-9.0.65-1.amzn2.0.2.noarch
tomcat-el-3.0-api-9.0.65-1.amzn2.0.2.noarch
tomcat-webapps-9.0.65-1.amzn2.0.2.noarch
src:
tomcat-9.0.65-1.amzn2.0.2.src
2025-09-23: CVE-2022-42252 was removed from this advisory.
2025-09-23: The severity of this advisory has been changed from important to low.