CVE-2021-24122: Apache Tomcat

Medium severity, CVSS 5.9. EPSS: 22.9% chance of exploitation in the next 30 days.

When serving resources from a network location using the NTFS file system, Apache Tomcat versions 10.0.0-M1 to 10.0.0-M9, 9.0.0.M1 to 9.0.39, 8.5.0 to 8.5.59 and 7.0.0 to 7.0.106 were susceptible to JSP source code disclosure in some configurations. The root cause was the unexpected behaviour of the JRE API File.getCanonicalPath() which in turn was caused by the inconsistent behaviour of the Windows API (FindFirstFileW) in some circumstances.

Affected products

• Apache Tomcat: from 7.0.0, up to and including 7.0.106; from 8.5.0, up to and including 8.5.59; from 9.0.1, up to and including 9.0.39; version 9.0.0 only; version 10.0.0 only
• Debian Debian Linux: version 9.0 only
• Oracle Agile Product Lifecycle Management: version 9.3.3 only; version 9.3.6 only

Published 2021-01-14. Last modified 2026-10-08.