Security Resilience

CVE-2024-21733

Info Disclosure in Apache Tomcat 8.5.7 – 8.5.64

Public PoCInfo Disclosure
Published
19 January 2024
Modified
17 June 2026
Patch / advisory
View advisory
CVSS Score v3.1 5.3
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
EPSS Score 0.14 97th percentile
Risk Priority 70 floored blend · peak EPSS

CVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.

Summary

CVE-2024-21733 is a medium-severity Generation of Error Message Containing Sensitive Information (CWE-209) vulnerability in Apache Tomcat. Its CVSS base score is 5.3 (Medium).

Operationally, exploitation aligns with the MITRE ATT&CK technique Protocol or Service Impersonation (T1001.003); ranked in the top 3% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

The strongest mitigations our analysis identified map to SI-11 (Error Handling) — see the control section below for these in your framework.

Deeper analysis AI-assisted summary

Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.

CVE-2024-21733 is a Generation of Error Message Containing Sensitive Information vulnerability, tracked as CWE-209, that affects Apache Tomcat versions 8.5.7 through 8.5.63 and 9.0.0-M11 through 9.0.43, with other end-of-life releases potentially impacted as well. The flaw carries a CVSS 3.1 score of 5.3 and permits partial disclosure of sensitive information over the network without authentication.

An unauthenticated remote attacker can trigger error responses that leak internal details, enabling information-gathering that supports further attacks against the Tomcat instance.

Apache Tomcat project advisories recommend upgrading to version 8.5.64 or later and 9.0.44 or later to resolve the issue; corresponding notices have been issued through the Apache mailing lists and downstream distributions such as Debian LTS.

The EPSS score has reached a peak of 0.7343 with a current value of 0.7095, indicating sustained but not sharply escalating exploitation interest since disclosure.

OWASP Top 10 for Web (2025)

A10:2025 Mishandling of Exceptional Conditions

EU & UK References

Vulnerability Data

Generation of Error Message Containing Sensitive Information vulnerability in Apache Tomcat.This issue affects Apache Tomcat: from 8.5.7 through 8.5.63, from 9.0.0-M11 through 9.0.43. Other, EOL versions may also be affected. Users are recommended to upgrade to version 8.5.64 onwards or…

more

9.0.44 onwards, which contain a fix for the issue.

CWE(s)
CWE-209

Related Threats

MITRE ATT&CK Enterprise Techniques

T1001.003 Protocol or Service Impersonation Command And Control
Adversaries may impersonate legitimate protocols or web service traffic to disguise command and control activity and thwart analysis efforts.
attack.mitre.org →
T1003.002 Security Account Manager Credential Access
Adversaries may attempt to extract credential material from the Security Account Manager (SAM) database either through in-memory techniques or through the Windows Registry where the SAM database is stored.
attack.mitre.org →
T1007 System Service Discovery Discovery
Adversaries may try to gather information about registered local system services.
attack.mitre.org →
T1008 Fallback Channels Command And Control
Adversaries may use fallback or alternate communication channels if the primary channel is compromised or inaccessible in order to maintain reliable command and control and to avoid data transfer thresholds.
attack.mitre.org →
T1012 Query Registry Discovery
Adversaries may interact with the Windows Registry to gather information about the system, configuration, and installed software.
attack.mitre.org →
T1016.002 Wi-Fi Discovery Discovery
Adversaries may search for information about Wi-Fi networks, such as network names and passwords, on compromised systems.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2026-29146Same product: Apache Tomcat
CVE-2026-59083Same product: Apache Tomcat
CVE-2023-46589Same product: Apache Tomcat
CVE-2026-24880Same product: Apache Tomcat
CVE-2025-48988Same product: Apache Tomcat
CVE-2026-41284Same product: Apache Tomcat
CVE-2025-55668Same product: Apache Tomcat
CVE-2026-65927Same product: Apache Tomcat
CVE-2026-55957Same product: Apache Tomcat
CVE-2026-43514Same product: Apache Tomcat

Affected Assets

apache
tomcat
9.0.0 · 8.5.7 — 8.5.64 · 9.0.1 — 9.0.44

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

—

Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)

—

Validate
Prove the fix (OWASP ASVS)
  • V16.5.1

Mitigating Controls (NIST 800-53 r5) AI

SI-11 Error Handling good match

si-11 directly requires error messages to avoid revealing exploitable information about the system or its data.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 partial match
blocks

Secure SDLC practices directly require sanitized error handling to prevent sensitive data disclosure.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.5.14 Information transfer partial match
removes
A.5.15 Access control partial match
removes
A.5.16 Identity management partial match
removes
A.5.17 Authentication information partial match
removes
A.5.18 Access rights partial match
removes
A.8.10 Information deletion partial match
removes

References