CVE-2025-55058 is a vulnerability identified in Rumpus FTP Server version 9.0.12, classified under CWE-20 for improper input validation. This flaw arises when the FTP server fails to adequately validate certain inputs from authenticated users with high privileges, potentially leading to a denial-of-service (DoS) condition. The CVSS 3.1 base score is 4.5 (medium severity), with the vector indicating network attack vector (AV:N), low attack complexity (AC:L), requiring high privileges (PR:H), and user interaction (UI:R). The impact is limited to availability (A:H), with no confidentiality (C:N) or integrity (I:N) loss. The vulnerability does not currently have known exploits in the wild, but its presence could allow an attacker with legitimate access to disrupt FTP services, causing downtime or service interruptions. The lack of a patch at the time of publication necessitates interim mitigations. The vulnerability’s exploitation requires an authenticated user with elevated privileges and user interaction, which limits its ease of exploitation but still poses a risk in environments where such access is granted. The FTP server is commonly used for file transfers in various organizations, and disruption could affect business operations relying on these services.

For European organizations, the primary impact of CVE-2025-55058 is on service availability. Disruption of FTP services could interrupt file transfer operations critical to business processes, supply chains, or data exchange. Sectors such as finance, manufacturing, and government agencies that rely on FTP for internal or external communications may experience operational delays or outages. While confidentiality and integrity are not directly threatened, the denial-of-service could indirectly affect business continuity and cause reputational damage. Organizations with high dependency on Rumpus FTP Server version 9.0.12 are at greater risk. Additionally, the requirement for high privileges and user interaction reduces the likelihood of widespread exploitation but does not eliminate insider threat or targeted attack scenarios. The absence of known exploits provides a window for proactive mitigation but also means attackers could develop exploits in the future.

1. Monitor official Rumpus vendor channels for patches addressing CVE-2025-55058 and apply updates promptly once available. 2. Restrict FTP server access to trusted networks and users, minimizing the number of accounts with high privileges. 3. Implement network segmentation and firewall rules to limit exposure of the FTP server to only necessary clients. 4. Employ multi-factor authentication (MFA) for all users with elevated privileges to reduce risk of credential compromise. 5. Monitor FTP server logs and network traffic for unusual activity or repeated failed attempts that could indicate exploitation attempts. 6. Prepare incident response plans specifically for FTP service disruptions to minimize downtime. 7. Consider alternative secure file transfer protocols or solutions with stronger security postures if feasible. 8. Educate privileged users about the risks of interacting with untrusted inputs or commands within the FTP environment.