Apache Tomcat CVE-2019-17563 Session Fixation Vulnerability



Date Discovered

December 18, 2019


Apache Tomcat is prone to a session-fixation vulnerability. An attacker can exploit this issue to hijack an arbitrary session and gain unauthorized access to the affected application. Apache Tomcat versions 9.0.0.M1 through 9.0.29 are vulnerable.

Technologies Affected

  • Apache Tomcat 9.0.0.M1
  • Apache Tomcat 9.0.0.M10
  • Apache Tomcat 9.0.0.M11
  • Apache Tomcat 9.0.0.M12
  • Apache Tomcat 9.0.0.M13
  • Apache Tomcat 9.0.0.M15
  • Apache Tomcat 9.0.0.M17
  • Apache Tomcat 9.0.0.M18
  • Apache Tomcat 9.0.0.M19
  • Apache Tomcat 9.0.0.M2
  • Apache Tomcat 9.0.0.M20
  • Apache Tomcat 9.0.0.M21
  • Apache Tomcat 9.0.0.M22
  • Apache Tomcat 9.0.0.M3
  • Apache Tomcat 9.0.0.M4
  • Apache Tomcat 9.0.0.M5
  • Apache Tomcat 9.0.0.M7
  • Apache Tomcat 9.0.0.M9
  • Apache Tomcat 9.0.0M6
  • Apache Tomcat 9.0.0M8
  • Apache Tomcat 9.0.1
  • Apache Tomcat 9.0.10
  • Apache Tomcat 9.0.12
  • Apache Tomcat 9.0.14
  • Apache Tomcat 9.0.16
  • Apache Tomcat 9.0.17
  • Apache Tomcat 9.0.18
  • Apache Tomcat 9.0.19
  • Apache Tomcat 9.0.20
  • Apache Tomcat 9.0.29
  • Apache Tomcat 9.0.4
  • Apache Tomcat 9.0.5
  • Apache Tomcat 9.0.7
  • Apache Tomcat 9.0.8
  • Apache Tomcat 9.0.9


Block external access at the network boundary, unless external parties require service.
If global access isn't needed, filter access to the affected computer at the network boundary. Restricting access to only trusted computers and networks might greatly reduce the likelihood of a successful exploit.

Deploy network intrusion detection systems to monitor network traffic for malicious activity.
Deploy NIDS to monitor network traffic for signs of anomalous or suspicious activity. This may indicate successful exploit attempts or activity that results from a successful exploit.

Do not follow links provided by unknown or untrusted sources.
Web users should be cautious about following links to sites that are provided by unfamiliar or suspicious sources. Filtering HTML from emails may help remove a possible vector for transmitting malicious links to users.

Updates are available. Please see the references or vendor advisory for more information.



William Marlow (IBM).

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