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Date: Thu, 14 Jan 2021 14:22:50 +0000
From: Mark Thomas <>
Subject: [SECURITY] CVE-2021-24122 Apache Tomcat Information Disclosure

CVE-2021-24122 Apache Tomcat Information Disclosure

Severity: Important

Vendor: The Apache Software Foundation

Versions Affected:
Apache Tomcat 10.0.0-M1 to 10.0.0-M9
Apache Tomcat 9.0.0.M1 to 9.0.39
Apache Tomcat 8.5.0 to 8.5.59
Apache Tomcat 7.0.0 to 7.0.106

When serving resources from a network location using the NTFS file
system it was possible to bypass security constraints and/or view the
source code for JSPs 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.

Users of the affected versions should apply one of the following
- Upgrade to Apache Tomcat 10.0.0-M10 or later
- Upgrade to Apache Tomcat 9.0.40 or later
- Upgrade to Apache Tomcat 8.5.60 or later
- Upgrade to Apache Tomcat 7.0.107 or later

This issue was identified by Ilja Brander.

2021-01-14 Original advisory


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