CVE-2025-66692 is a buffer over-read vulnerability located in the PublicKey::verify() method of Binance's Trust Wallet Core software, which is used for cryptocurrency wallet operations. The vulnerability arises when the method processes crafted input that exceeds expected buffer boundaries, causing the software to read beyond allocated memory. This can lead to a Denial of Service (DoS) condition by crashing or destabilizing the wallet application, interrupting normal cryptographic verification processes. The flaw affects versions of Trust Wallet Core prior to commit 5668c67, although specific version numbers are not provided. The vulnerability does not require authentication, meaning an attacker can exploit it remotely by submitting maliciously crafted data to the verification function. No known exploits have been reported in the wild as of the publication date. The absence of a CVSS score suggests this is a newly disclosed vulnerability. The primary impact is on availability, as the buffer over-read does not appear to allow code execution or data leakage, but it can cause service interruptions. Trust Wallet Core is widely used in cryptocurrency wallets and related fintech applications, making this vulnerability relevant to organizations relying on these technologies. The vulnerability highlights the importance of secure input validation and memory safety in cryptographic libraries.

For European organizations, the main impact of CVE-2025-66692 is the potential disruption of cryptocurrency wallet services that utilize Trust Wallet Core. This can lead to temporary denial of service, affecting transaction verification and user access to wallet functionalities. Financial institutions, fintech companies, and cryptocurrency exchanges that integrate Trust Wallet Core may experience service outages or degraded performance, which could erode customer trust and cause financial losses. Additionally, organizations providing wallet services as part of broader digital asset management platforms may face operational challenges. While the vulnerability does not appear to compromise confidentiality or integrity, the availability impact can be significant in environments requiring high uptime and reliability. The lack of known exploits reduces immediate risk but does not eliminate the potential for future attacks. European regulatory frameworks emphasizing operational resilience in financial services increase the importance of timely mitigation. Organizations heavily invested in blockchain and cryptocurrency technologies are particularly at risk.

To mitigate CVE-2025-66692, organizations should prioritize updating Trust Wallet Core to versions including the fix introduced at commit 5668c67 or later. In the absence of an official patch, applying temporary controls such as input validation to reject malformed or suspicious data before it reaches the PublicKey::verify() method can reduce risk. Implementing sandboxing or process isolation for wallet operations can limit the impact of potential crashes. Monitoring application logs for unusual input patterns or crashes related to cryptographic verification functions can provide early detection of exploitation attempts. Organizations should also engage with Binance or Trust Wallet Core maintainers to obtain timely security updates and advisories. Incorporating fuzz testing and memory safety analysis into development and deployment pipelines can help identify similar vulnerabilities proactively. Finally, educating developers and security teams about secure coding practices for cryptographic libraries will reduce future risks.