CVE-2025-69621 is a vulnerability identified in Comic Book Reader v1.0.95, specifically in its file import functionality. The flaw permits an attacker to perform arbitrary file overwrite operations on critical internal files of the application. By crafting malicious comic book files and convincing a user to import them, an attacker can overwrite files that may lead to arbitrary code execution or the exposure of sensitive information stored or processed by the application. The vulnerability arises from insufficient validation or sanitization of file paths or names during the import process, enabling path traversal or similar techniques to overwrite files outside the intended directories. Although no CVSS score has been assigned yet and no known exploits are reported, the potential impact is significant due to the possibility of executing arbitrary code and compromising confidentiality. The vulnerability does not require prior authentication but does require user interaction to import the malicious file. No patches or official mitigations have been released at the time of publication, increasing the risk window. The affected software is a specialized comic book reader application, which may limit the scope but still poses risks to users and organizations relying on it for digital media consumption.

For European organizations, the impact of CVE-2025-69621 could include unauthorized system access, data breaches, and potential lateral movement within networks if exploited. Organizations using Comic Book Reader for digital content management or distribution could face operational disruptions or data integrity issues. Exposure of sensitive information could lead to privacy violations under GDPR, resulting in regulatory penalties. The arbitrary code execution capability could allow attackers to install malware, ransomware, or establish persistent access, increasing the risk of broader cyberattacks. Although the software is niche, sectors such as digital media companies, educational institutions, and libraries that use this application may be particularly vulnerable. The lack of patches and known exploits means organizations must proactively mitigate the risk to avoid future compromise.

1. Immediately restrict the import of comic book files from untrusted or external sources to prevent malicious file introduction. 2. Implement application whitelisting or sandboxing for Comic Book Reader to contain potential exploitation. 3. Monitor file system integrity in directories used by the application to detect unauthorized file modifications. 4. Educate users about the risks of importing files from unknown sources and enforce strict policies on file handling. 5. Regularly check for updates or patches from the software vendor and apply them promptly once available. 6. Consider alternative software solutions with better security track records if feasible. 7. Employ endpoint detection and response (EDR) tools to identify suspicious behaviors related to file overwrites or code execution. 8. Use network segmentation to limit the impact of a potential compromise originating from this application.