External risk intelligence

Eclipse Jersey Race Condition Bypasses SSL Configurations

CVE advisorySeverity: CRITICAL (CVSS 9.4)

CVE-2025-12383

Eclipse Jersey is a framework for building RESTful web services. While these services are often exposed to the internet, the vulnerability requires specific race conditions to bypass SSL/TLS configurations. Because the impact depends on application-specific implementation and network architecture rather than being a default public-facing gateway or identity service, a score of 3 is appropriate.

Eclipse Jersey

2.453.0.163.1.9

Halo Surface Signal: 3 out of 5 — possibly public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

This advisory addresses a race condition vulnerability in Eclipse Jersey, a framework used for building web services. The issue can cause critical SSL configurations, like mutual authentication, to be ignored, potentially leading to unauthorized trust in insecure servers. Understanding the relevance of this vulnerability to our specific deployments is the primary concern.

  • A technical flaw can bypass security settings.
  • It affects how secure connections are handled.
  • Confirm if our web services are exposed.

Attack Path

How an attacker could exploit the issue

An attacker could reach this vulnerability by interacting with a service that uses the vulnerable Eclipse Jersey component. The attacker would need to leverage specific, albeit uncertain, race conditions to bypass security configurations like mutual authentication. If successful, this could lead to the service trusting an insecure server, potentially exposing sensitive data or allowing further compromise.

  • Network access required, no privileges.
  • Triggered by specific race conditions.
  • Leads to trusting insecure servers.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability could allow an attacker to bypass critical SSL configurations, potentially leading to unauthorized trust in insecure servers under specific conditions.

  • Sensitive SSL configurations could be bypassed.
  • Exploitation may require specific race conditions.
  • Insecure server trust could be established.

Operational Fix

Recommended remediation, mitigation, and detection steps

The critical race condition in Eclipse Jersey could allow unauthorized trust in insecure servers by bypassing SSL configurations. Owners of applications using vulnerable Jersey versions should first identify all deployments, confirm exposure and business criticality, and then engage the appropriate teams for remediation planning.

  • Identify application owners and critical deployments.
  • Verify SSL configuration bypass and server trust.
  • Plan remediation considering vendor coordination.

Supplementary metadata

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

Frequently asked questions

What is Eclipse Jersey?

Eclipse Jersey is an open-source framework used by developers to build RESTful web services in Java. It serves as the reference implementation for JAX-RS, providing the tools needed to handle HTTP requests and responses, manage data routing, and implement security protocols like SSL/TLS for communication between services.

How does CVE-2025-12383 affect SSL security?

This vulnerability is a race condition, categorized as CWE-362. It occurs when the timing of internal processes causes the software to improperly initialize or apply SSL settings. Because of this flaw, the application may inadvertently ignore critical security configurations, such as mutual authentication or custom trust stores, during a connection attempt.

Do I need specific conditions to trigger this flaw?

Yes. Beyond simply running a vulnerable version, an attacker must successfully induce a specific race condition during the SSL handshake process. The vulnerability does not trigger if the software successfully completes the handshake as intended, and it relies on precise timing rather than a simple configuration error.

How should I interpret the risk of CVE-2025-12383?

Halo Surface Signal notes that while Eclipse Jersey services are frequently internet-facing, this flaw is not a default gateway vulnerability. Risk depends heavily on your specific network architecture and how your application implements SSL. It is most relevant if your service requires strict mutual authentication to verify incoming connections.

When should I start addressing this vulnerability?

Begin by inventorying your applications to identify which use the affected Jersey versions. Verify whether those services rely on custom SSL configurations or mutual authentication that could be bypassed. Once you have mapped your critical deployments, work with your engineering teams to prioritize remediation based on those specific business dependencies.

References