Rewterz Threat Advisory – CVE-2021-43980 – Apache Tomcat Vulnerability

Severity

Medium

Analysis Summary

CVE-2021-43980

Apache Tomcat could allow a remote attacker to obtain sensitive information, caused by a long standing concurrency flaw in the simplified implementation of blocking reads and writes. By sending a specially-crafted request, an attacker could exploit this vulnerability to obtain Http11Processor instance information, and use this information to launch further attacks against the affected system.

Impact

• Information Disclosure

Indicators Of Compromise

CVE

• CVE-2021-43980

Affected Vendors

Apache

Affected Products

• Apache Tomcat 8.5.0
• Apache Tomcat 10.0.0-M1
• Apache Tomcat 9.0.0-M1
• Apache Tomcat 10.1.0-M1
• Apache Tomcat 8.5.77
• Apache Tomcat 9.0.60
• Apache Tomcat 10.0.18
• Apache Tomcat 10.1.0-M12

Remediation

Upgrade to the latest version of Apache Tomcat, available from the Apache Website.

Apache Website