CVE-2025-13804 identifies an information disclosure vulnerability in the nutzam NutzBoot framework, specifically affecting version 2.6.0-SNAPSHOT. The vulnerability resides in an unknown function within the EthModule.java file, part of the Ethereum Wallet Handler component of the nutzboot-demo-simple-web3j module. This flaw allows an attacker to remotely manipulate the component, resulting in unauthorized disclosure of sensitive information. The vulnerability does not require authentication or user interaction, and the attack vector is network-based, making it relatively easy to exploit. The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P) indicates low complexity and no privileges required, but a low impact on confidentiality, with no impact on integrity or availability. The exploit has been publicly released, increasing the risk of exploitation, although no active exploitation has been confirmed. The affected component is related to Ethereum wallet handling, which suggests that sensitive cryptographic keys or wallet data could be exposed if exploited. As NutzBoot is a Java-based framework used in blockchain-related applications, this vulnerability could impact applications relying on it for Ethereum wallet management or blockchain interactions. No official patches have been linked yet, so users must monitor vendor advisories closely. The vulnerability highlights the need for secure coding practices in blockchain wallet handlers and careful exposure of such components to untrusted networks.

For European organizations, especially those engaged in blockchain technology, fintech, or cryptocurrency services, this vulnerability poses a risk of sensitive information leakage related to Ethereum wallets. Disclosure of wallet-related data could lead to theft of digital assets, loss of customer trust, and regulatory non-compliance, particularly under GDPR if personal data is involved. The medium severity reflects moderate risk, but the ease of remote exploitation without authentication increases the threat landscape. Organizations using the affected NutzBoot version in production environments may face operational and reputational damage if exploited. The impact is heightened in sectors where blockchain wallet security is critical, such as financial services, cryptocurrency exchanges, and decentralized finance (DeFi) platforms. Additionally, the public availability of exploit code lowers the barrier for attackers, increasing the urgency for mitigation. However, since no active exploitation is reported, the immediate risk is moderate but could escalate rapidly if attackers begin targeting vulnerable systems. The vulnerability does not affect system integrity or availability, so the primary concern is confidentiality breaches.

1. Monitor official nutzam advisories and apply security patches promptly once released for version 2.6.0-SNAPSHOT or upgrade to a non-vulnerable version. 2. Restrict network access to the Ethereum Wallet Handler component by implementing firewall rules or network segmentation to limit exposure to untrusted networks. 3. Conduct a thorough code review of the EthModule.java and related wallet handling modules to identify and remediate similar information disclosure issues. 4. Employ runtime application self-protection (RASP) or web application firewalls (WAF) to detect and block suspicious requests targeting the vulnerable endpoints. 5. Implement strict access controls and logging around wallet management functions to detect unauthorized access attempts. 6. Educate developers on secure coding practices for blockchain wallet handling, emphasizing the importance of minimizing sensitive data exposure. 7. Consider isolating wallet management services in dedicated environments with enhanced security controls. 8. Regularly audit and monitor logs for unusual activity that could indicate exploitation attempts. 9. If feasible, replace the vulnerable component with alternative, well-maintained libraries or frameworks with a strong security track record.