CVE-2025-14199 is a vulnerability identified in the Verysync software, specifically affecting versions 2.21.0 through 2.21.3. The flaw resides in the Web Administration Module, within an unspecified function related to the file path /rest/f/api/resources/f96956469e7be39d/tmp/text.txt?override=false. This vulnerability allows an attacker to perform an unrestricted file upload remotely. The attack vector requires network access and low-level privileges but does not require user interaction or elevated privileges. The unrestricted upload capability means an attacker can potentially upload malicious files, such as web shells or scripts, which could be executed to compromise the system further. The CVSS 4.0 vector indicates low complexity and no authentication required beyond limited privileges, with partial impact on confidentiality, integrity, and availability. The vendor was notified but has not responded, and no patches or mitigations have been officially released. Although no active exploitation in the wild has been reported, the public availability of exploit code increases the risk of attacks. The vulnerability's presence in a web administration component makes it particularly sensitive, as successful exploitation could lead to unauthorized administrative actions or persistent access.

For European organizations, this vulnerability poses a moderate risk primarily to those deploying Verysync in their infrastructure. Successful exploitation could lead to unauthorized file uploads, enabling attackers to execute arbitrary code, escalate privileges, or disrupt services. This could compromise sensitive data confidentiality, integrity of systems, and availability of services. Organizations in sectors such as finance, government, healthcare, and critical infrastructure that rely on Verysync for file synchronization or administrative functions are particularly vulnerable. The lack of vendor response and patches increases exposure time. Additionally, the presence of publicly available exploit code lowers the barrier for attackers, potentially increasing targeted attacks against European entities. The impact is compounded in environments where network segmentation or access controls are weak, allowing attackers easier access to the vulnerable endpoint.

European organizations should implement immediate compensating controls to reduce risk. These include restricting network access to the Web Administration Module endpoint to trusted administrators only, ideally via VPN or secure tunnels. Implement strict input validation and file type restrictions on uploads if configurable. Monitor logs and network traffic for unusual upload activity or access patterns to the vulnerable URL. Employ web application firewalls (WAFs) with custom rules to detect and block suspicious upload attempts targeting the specific endpoint. Conduct internal audits to identify all Verysync instances and verify versions, prioritizing upgrades or replacements where possible. If upgrading is not immediately feasible due to lack of vendor patches, consider isolating affected systems or disabling the vulnerable module temporarily. Maintain heightened incident response readiness to detect and respond to potential exploitation attempts. Engage with the vendor or community for updates and patches, and consider alternative software solutions if the vendor remains unresponsive.