External risk intelligence

JFreeChart CategoryLineAnnotation NullPointerException

CVE advisorySeverity: CRITICAL (CVSS 9.1)

CVE-2024-22949

JFreeChart is a Java library used for generating charts within applications. It is a client-side or server-side component integrated into software rather than a standalone network service, edge gateway, or public-facing application. Its usage is typically embedded within internal or application-specific logic, making direct public-internet exposure of this specific component highly unlikely.

Out-of-bounds Read

Jfreechart

1.5.4

Halo Surface Signal: 1 out of 5 — much less likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

A critical vulnerability was reported in JFreeChart, a widely used Java charting library. The reported issue, a NullPointerException, could potentially allow for unauthorized access to sensitive information or disruption of services if exploited. However, there is significant dispute from multiple third parties regarding the validity of this vulnerability, suggesting it may be based on unreliable testing.

Potential chart library issue identified.
Validity of the reported vulnerability is disputed.
Confirm relevance and exposure of JFreeChart.

Attack Path

How an attacker could exploit the issue

An attacker could potentially reach this vulnerability if the affected charting library is exposed in a way that allows for malicious input. The vulnerability exists within the component responsible for handling line annotations in categorized charts. If an attacker can manipulate this component, it could lead to a denial-of-service condition.

No authentication required.
Malicious input to chart annotation.
Potential for denial-of-service.

Live Threat

Current exploitation, exposure, and threat context

The described vulnerability in JFreeChart could lead to a denial-of-service condition when processing chart annotations. This could affect the availability of applications that embed this charting library. There is no indication of sensitive data exposure or unauthorized access.

Application availability.
Malicious input could trigger failure.
Services may become unresponsive.

Operational Fix

Recommended remediation, mitigation, and detection steps

The ownership of this issue likely falls to application owners and platform teams responsible for Java-based applications, as JFreeChart is a Java charting library. The immediate practical step is to identify all instances where JFreeChart is deployed, assess their reachability and business criticality, and confirm the accountable owner for each instance before planning remediation.

Own by application and platform teams.
Verify JFreeChart deployment and reachability.
Plan remediation based on confirmed risk.

Supplementary metadata

CVSS vector

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Frequently asked questions

What is JFreeChart?

JFreeChart is a widely used open-source Java library designed to help developers create professional-looking charts and graphs within their applications. It is not a standalone program; instead, it acts as a building block integrated into larger software systems to visualize data, such as bar, pie, or line charts.

What does CVE-2024-22949 mean for JFreeChart?

CVE-2024-22949 refers to a reported NullPointerException, which is a common programming error that occurs when software tries to use an object that does not exist. This weakness, categorized as CWE-125, is claimed to exist in the component that handles line annotations on charts. Note that the validity of this finding is currently disputed by several third parties who suggest the original report may have relied on unreliable testing methods.

How can this NullPointerException be triggered?

The reported issue suggests that a crash could occur if an attacker provides specific, malicious input to the chart annotation component. It is important to note that simply using the library does not trigger this error. The defect would only manifest if an application specifically processes tainted or malformed data through the vulnerable CategoryLineAnnotation component.

Do I need to worry about this in my environment?

Halo Surface Signal indicates that because JFreeChart is an embedded library rather than a public-facing network service, it is very unlikely to be directly accessible from the internet. You should focus your attention on custom applications where you have integrated this library to accept and process user-supplied chart data, as these represent the only meaningful attack surfaces.

What should I do if I use JFreeChart?

Your first step is to perform an inventory of your internal Java applications to identify which ones use JFreeChart. Once identified, consult with your development teams to determine if your software processes user input through chart annotations. Given the disputed nature of this vulnerability, prioritize verifying whether your specific application logic is susceptible before planning any changes.

References

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.