CVE-2025-13804 is an information disclosure vulnerability identified in the nutzam NutzBoot framework, specifically affecting versions up to 2.6.0-SNAPSHOT. The vulnerability resides in an unknown function within the EthModule.java file located in the Ethereum Wallet Handler component of the NutzBoot demo application. This flaw allows remote attackers to manipulate the system, resulting in unauthorized disclosure of sensitive information. The attack vector requires no user interaction and no elevated privileges, making it relatively easy to exploit remotely over the network. The vulnerability has been assigned a CVSS 4.0 base score of 5.3, indicating a medium severity level. The exploit code has been publicly released, increasing the risk of exploitation, although no confirmed in-the-wild attacks have been reported to date. The nature of the vulnerability suggests that attackers could gain access to confidential Ethereum wallet data or transaction details, potentially compromising the integrity of blockchain operations relying on NutzBoot. The lack of a patch at the time of disclosure necessitates immediate code review and implementation of compensating controls to mitigate risk. Given the component's role in handling Ethereum wallets, the vulnerability poses a significant risk to applications managing blockchain assets or decentralized finance (DeFi) services built on NutzBoot.

For European organizations, the information disclosure vulnerability in NutzBoot's Ethereum Wallet Handler could lead to unauthorized exposure of sensitive wallet credentials, private keys, or transaction data. This exposure can undermine the confidentiality of blockchain assets, potentially facilitating further attacks such as theft of cryptocurrencies or manipulation of blockchain transactions. Organizations involved in fintech, blockchain development, or decentralized finance services are particularly at risk. The vulnerability could damage trust in blockchain applications, lead to financial losses, and cause regulatory compliance issues under GDPR if personal data is involved. Additionally, the public availability of exploit code increases the likelihood of opportunistic attacks targeting vulnerable systems. The impact is amplified in sectors where Ethereum-based solutions are integral, including banking, insurance, and supply chain management. Disruption or compromise of these systems could have cascading effects on business operations and client confidence.

1. Monitor the nutzam vendor channels closely for official patches addressing CVE-2025-13804 and apply them immediately upon release. 2. Conduct a thorough code audit of the EthModule.java and related Ethereum Wallet Handler components to identify and remediate the specific information disclosure flaw. 3. Implement strict network segmentation and firewall rules to restrict access to the vulnerable NutzBoot components, limiting exposure to trusted internal networks only. 4. Employ runtime application self-protection (RASP) or web application firewalls (WAFs) with custom rules to detect and block suspicious requests targeting the vulnerable endpoints. 5. Review and enhance logging and monitoring to detect anomalous access patterns or data exfiltration attempts related to the Ethereum Wallet Handler. 6. If feasible, replace or isolate the vulnerable NutzBoot version in production environments until a secure version is available. 7. Educate development and security teams about the risks of information disclosure in blockchain wallet handlers and enforce secure coding practices for sensitive modules. 8. Consider multi-factor authentication and encryption of sensitive wallet data at rest and in transit to reduce the impact of potential disclosures.