CVE-2021-24122Network attack vector

JSP source disclosure via inconsistent canonical path resolution

Published Jan 14, 2021 · Updated Feb 13, 2025

Information disclosure in Apache Tomcat allows remote attackers to read JSP source code through crafted requests in affected configurations. AbstractFileResourceSet accepts colon-containing Windows resource names that File.getCanonicalPath resolves inconsistently through FindFirstFileW. Exposure requires web resources served from a network location using NTFS on Windows; the response reveals application logic and any secrets embedded in JSP source, with no reported write or availability impact.

CVSS severity5.9
Medium
EPSS probability22.85%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Apache Tomcat allows remote attackers to read JSP source code through crafted requests in affected configurations. AbstractFileResourceSet accepts colon-containing Windows resource names that File.getCanonicalPath resolves inconsistently through FindFirstFileW. Exposure requires web resources served from a network location using NTFS on Windows; the response reveals application logic and any secrets embedded in JSP source, with no reported write or availability impact.

The record

CVE
CVE-2021-24122
Published
Jan 14, 2021
Updated
Feb 13, 2025
Vendor
The Apache Software Foundation
Product
Apache Tomcat
Classifications
CWE-706, T1005
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 14, 2021CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=Apache Tomcat 10 <10.0.0-M10
  2. Affected versionversion=Apache Tomcat 7 <7.0.106
  3. Affected versionversion=Apache Tomcat 8.5 <8.5.60
  4. Affected versionversion=Apache Tomcat 9 <9.0.40

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Apache Software Foundation · Apache Tomcatversion=Apache Tomcat 10 <10.0.0-M10; version=Apache Tomcat 7 <7.0.106; version=Apache Tomcat 8.5 <8.5.60; version=Apache Tomcat 9 <9.0.40

Published CVSS scores

4.3NVDAV:N/AC:M/Au:N/C:P/I:N/A:N
5.9NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-706Use of Incorrectly-Resolved Name or Reference
T1005Data from Local System

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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