CVE-2018-1323: Apache Tomcat Jk Connector

High severity, CVSS 7.5. EPSS: 46.4% chance of exploitation in the next 30 days.

The IIS/ISAPI specific code in the Apache Tomcat JK ISAPI Connector 1.2.0 to 1.2.42 that normalised the requested path before matching it to the URI-worker map did not handle some edge cases correctly. If only a sub-set of the URLs supported by Tomcat were exposed via IIS, then it was possible for a specially constructed request to expose application functionality through the reverse proxy that was not intended for clients accessing Tomcat via the reverse proxy.

Affected products

• Apache Tomcat Jk Connector: from 1.2.0, up to and including 1.2.42

Published 2018-03-12. Last modified 2026-06-17.