Amazon Linux 2 Security Advisory: ALAS2TOMCAT8.5-2023-009
Advisory Released Date: 2023-09-25
Advisory Updated Date: 2025-09-23
A flaw was found in Apache Tomcat. When responding to new h2c connection requests, Apache Tomcat could duplicate request headers and a limited amount of request body from one request to another meaning user A and user B could both see the results of user A's request. The highest threat from this vulnerability is to data confidentiality. (CVE-2021-25122)
The fix for CVE-2020-9484 was incomplete. When using Apache Tomcat 10.0.0-M1 to 10.0.0, 9.0.0.M1 to 9.0.41, 8.5.0 to 8.5.61 or 7.0.0. to 7.0.107 with a configuration edge case that was highly unlikely to be used, the Tomcat instance was still vulnerable to CVE-2020-9494. Note that both the previously published prerequisites for CVE-2020-9484 and the previously published mitigations for CVE-2020-9484 also apply to this issue. (CVE-2021-25329)
Affected Packages:
tomcat
Note:
This advisory is applicable to Amazon Linux 2 - Tomcat8.5 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 ALAS2TOMCAT8.5-2023-009 to update your system.
noarch:
tomcat-8.5.63-1.amzn2.noarch
tomcat-admin-webapps-8.5.63-1.amzn2.noarch
tomcat-docs-webapp-8.5.63-1.amzn2.noarch
tomcat-javadoc-8.5.63-1.amzn2.noarch
tomcat-jsvc-8.5.63-1.amzn2.noarch
tomcat-jsp-2.3-api-8.5.63-1.amzn2.noarch
tomcat-lib-8.5.63-1.amzn2.noarch
tomcat-servlet-3.1-api-8.5.63-1.amzn2.noarch
tomcat-el-3.0-api-8.5.63-1.amzn2.noarch
tomcat-webapps-8.5.63-1.amzn2.noarch
src:
tomcat-8.5.63-1.amzn2.src
2025-09-23: CVE-2020-9484 was removed from this advisory.
2025-09-23: The severity of this advisory has been changed from important to medium.