External risk intelligence

Legion of the Bouncy Castle BC-JAVA could allow internal attackers to bypass security measures.

CVE advisorySeverity: CRITICAL (CVSS 9.3)

CVE-2025-14813

An external attacker could exploit a flaw in BC-JAVA's cryptography to weaken encryption, potentially exposing confidential data. This matters to the business as it could lead to unauthorized access to sensitive information.

1Halo Surface Signal

External exposure likelihood

Halo Surface Signal score for CVE-2025-14813

The vulnerability exists within a Java cryptographic library (BC-JAVA), which is a code-level dependency embedded within applications rather than a standalone network service. Because it is a low-level library component, it lacks a direct network listener or public-facing interface, making it very unlikely to be directly reachable from the public internet.

Horizon Alert

Summary of the vulnerability and why it matters

This vulnerability in the Bouncy Castle BC-JAVA cryptographic library means that it may not be protecting data as securely as intended. This could allow for the compromise of sensitive information or the integrity of operations relying on this library.

  • Sensitive data may be at risk.
  • Core cryptographic functions are impacted.

Attack Path

How an attacker could exploit the issue

An attacker could exploit this vulnerability if they can influence the cryptographic algorithm choices within an application using the affected library. This could allow them to decrypt sensitive data or forge digital signatures.

  • Local access is likely.
  • Targets cryptographic operations.
  • Weak algorithm choice is critical.

Live Threat

Current exploitation, exposure, and threat context

Attackers are unlikely to weaponize this vulnerability because it resides in a cryptographic library that requires local access and specific application integration. Exploiting this would necessitate prior unauthorized access to the system or an application's internal workings.

  • Primarily affects local users.
  • No known public exploits exist.
  • Recent fixes indicate active development.

Priority actions

Operational Fix

Recommended remediation, mitigation, and detection steps

Prioritize patching for BC-JAVA versions affected by the broken cryptographic algorithm. If immediate patching isn't feasible, consider isolating services that use this library or implementing strict access controls to limit potential local exploitation pathways.

  • Apply BC-JAVA patches (versions 1.80.2, 1.81.1, 1.84, or later).
  • Monitor for suspicious local activity.
  • Evaluate all direct and transitive dependencies.

Frequently asked questions

What is the Bouncy Castle BC-JAVA library and what is it used for?

The Bouncy Castle BC-JAVA library is a collection of Java cryptographic functions. It is used by developers to implement various security features like encryption, decryption, and digital signatures within their Java applications, ensuring data confidentiality and integrity.

How does CVE-2025-14813 relate to a broken cryptographic algorithm?

CVE-2025-14813 describes a vulnerability where the Legion of the Bouncy Castle BC-JAVA library uses a cryptographic algorithm that is considered broken or risky. This means the algorithm may not provide the expected level of security, potentially allowing sensitive data to be exposed or tampered with.

What conditions are needed for CVE-2025-14813 to be exploited?

Exploiting this vulnerability requires an attacker to have local access to the system where the affected BC-JAVA library is running. It is not triggered by remote network access, and specific conditions related to how the library's cryptographic algorithms are chosen and used within an application would need to be met.

Who needs to care about the internal risk of CVE-2025-14813?

Organizations that use the affected versions of Bouncy Castle BC-JAVA within their internal applications should care. Because the vulnerability is classified as internal, it poses a risk to data and operations that are not directly exposed to the public internet but are still valuable targets.

What are the first steps for running this technology?

The primary step is to update the BC-JAVA library to a secure version, such as 1.80.2, 1.81.1, 1.84, or later. If immediate patching isn't possible, consider isolating systems that use the affected library and strengthening access controls to limit potential local exploitation.

References