External risk intelligence

Joda Time NullPointerException in PeriodFormat wordBased method

CVE advisorySeverity: CRITICAL (CVSS 9.1)

CVE-2024-23080

Joda Time is a library used within applications, not a standalone network-facing service, appliance, or edge gateway. It runs as part of a larger application's internal code execution flow, making it library-level code rather than an internet-exposed surface.

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 potential security issue has been identified in a widely used date and time formatting library, Joda Time. While initially assessed as critical, there is significant dispute from multiple third parties regarding the validity of the reported vulnerability, suggesting it may be based on unreliable tool findings. The main concern is to confirm if this library is used within our environment and, if so, to verify its actual exposure.

Issue: Potential flaw in a date formatting library.
Why remember: Disputed flaw in common software component.
Executive takeaway: Verify usage and assess relevance.

Attack Path

How an attacker could exploit the issue

An attacker could potentially trigger this vulnerability by sending specially crafted input to an application that uses the vulnerable Joda Time library. If the application processes this input without proper validation, it could lead to a crash or denial of service. The existence of this vulnerability is disputed, and the evidence may be based on unreliable tools.

No authentication or privileges required.
Vulnerable code executed via crafted input.
Potential for application crash or denial of service.

Live Threat

Current exploitation, exposure, and threat context

When the Joda-Time library is used in an application, a specific formatting function could trigger a NullPointerException, potentially affecting the application's stability. There is a dispute regarding the evidence for this vulnerability, with some third parties suggesting it may not be a genuine security risk.

Application stability.
Through malformed input to a formatting function.
Application crash.

Operational Fix

Recommended remediation, mitigation, and detection steps

This CVE describes a potential vulnerability in the Joda Time library. Since Joda Time is a Java library, application owners or platform teams responsible for the applications that include this library would likely manage remediation. The immediate first step is to determine if any applications use the affected Joda Time component and assess its reachability and criticality to business operations before planning any fixes.

Application owners should verify Joda Time usage.
Confirm reachability and business criticality of impacted applications.
Plan remediation based on confirmed risk.

Supplementary metadata

CVSS vector

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Frequently asked questions

What is Joda Time?

Joda Time is a widely used Java library that provides high-quality replacements for the standard date and time classes. Developers integrate it into their own applications to simplify complex time-based calculations, formatting, and manipulation tasks. It is not a standalone program or network service, but rather a functional component that runs inside the memory space of a larger Java application.

What does CWE-476 mean for CVE-2024-23080?

CWE-476 refers to a Null Pointer Dereference. In the context of this CVE, it suggests that the software attempts to use a memory reference that is null, which could cause the program to crash. It is important to note that this specific report is disputed by third parties, who argue that the findings likely stem from an unreliable automated tool rather than a genuine security weakness in the library's code.

How could someone trigger this NullPointerException?

An attacker would theoretically need to provide specifically crafted input that reaches the PeriodFormat::wordBased method within the library. If an application takes user-supplied data and passes it into this formatting function without checking it first, it might cause the application to fail. Simply having the library installed is not enough; the application must actively process malformed data through that specific function path to potentially trigger a crash.

Do I need to worry about this if my app is internal?

Halo Surface Signal notes that Joda Time is a library, not a standalone network-facing service or edge gateway. Because it executes as part of an application's internal code flow, its reachability is limited to the specific application functions that call it. You should prioritize assessing applications that process untrusted external data, as these represent a more direct path to the vulnerable code than internal-only processes.

When should I take action for this CVE?

Your first step is to confirm if your applications actually include this specific version of Joda Time. Since the vulnerability's existence is disputed, avoid rushing into emergency updates. Instead, catalog your usage, identify which applications rely on the library to process external input, and monitor the library's official maintainers for any verified guidance or future updates that address the reported stability concerns.

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.