CVE-2025-55058: Maxum Rumpus Input Validation Vulnerability

CVE-2025-55058 Overview

CVE-2025-55058 is a critical improper input validation vulnerability (CWE-20) affecting Maxum Rumpus, a file transfer and web server software solution. This vulnerability allows unauthenticated remote attackers to exploit insufficient input validation mechanisms, potentially leading to complete system compromise with high impact on confidentiality, integrity, and availability.

Critical Impact

This network-exploitable vulnerability requires no authentication or user interaction, enabling remote attackers to potentially achieve full system compromise through improper input validation flaws.

Affected Products

• Maxum Rumpus version 9.0.12
• Maxum Rumpus (all potentially unpatched versions)

Discovery Timeline

• 2025-11-17 - CVE-2025-55058 published to NVD
• 2025-11-24 - Last updated in NVD database

Technical Details for CVE-2025-55058

Vulnerability Analysis

CVE-2025-55058 stems from improper input validation within Maxum Rumpus, a file sharing and web server application commonly used for FTP and web-based file transfers. The vulnerability allows attackers to submit malicious input that bypasses validation mechanisms, potentially enabling unauthorized actions on the target system.

The network-based attack vector combined with no required privileges or user interaction makes this vulnerability particularly dangerous in internet-facing deployments. An attacker can remotely exploit this flaw without any authentication, making exposed Rumpus servers immediate targets for opportunistic attacks.

Root Cause

The root cause is classified as CWE-20 (Improper Input Validation), indicating that the application fails to properly validate, filter, or sanitize user-controlled input before processing. This can occur when input bounds are not checked, when special characters are not properly escaped, or when input type validation is missing or incomplete.

In the context of a file transfer server like Rumpus, improper input validation could manifest in various areas including filename handling, path processing, authentication parameters, or web interface inputs.

Attack Vector

The attack vector is network-based, meaning an attacker can exploit this vulnerability remotely without physical access to the target system. The attack requires:

• Network access to the Rumpus server (typically via HTTP/HTTPS or FTP ports)
• No authentication or valid user credentials
• No user interaction on the target system

Exploitation involves crafting malicious input that the server processes without adequate validation. Due to the nature of input validation vulnerabilities, successful exploitation could result in various outcomes including unauthorized data access, data manipulation, or service disruption depending on the specific component affected.

Detection Methods for CVE-2025-55058

Indicators of Compromise

• Unusual or malformed requests in Rumpus server access logs
• Unexpected file system changes or unauthorized file access patterns
• Anomalous network traffic patterns to Rumpus service ports
• Server errors or crashes associated with input processing

Detection Strategies

• Monitor Rumpus server logs for requests containing unusual characters, excessively long inputs, or unexpected encoding
• Deploy web application firewall (WAF) rules to detect and block common input validation attack patterns
• Implement network intrusion detection signatures for anomalous traffic targeting Rumpus services
• Establish baseline behavior for legitimate Rumpus traffic and alert on deviations

Monitoring Recommendations

• Enable detailed logging on Rumpus servers and centralize log collection
• Configure alerts for repeated failed requests or error responses that may indicate exploitation attempts
• Monitor system resource utilization for signs of exploitation or denial of service
• Review file system integrity on systems running vulnerable Rumpus versions

How to Mitigate CVE-2025-55058

Immediate Actions Required

• Identify all instances of Maxum Rumpus version 9.0.12 in your environment
• Check the Maxum vendor website for security updates or patches addressing this vulnerability
• If possible, restrict network access to Rumpus servers using firewall rules to trusted IP ranges only
• Consider temporarily disabling internet-facing Rumpus services until a patch is available

Patch Information

At the time of publication, specific patch information is not available in the CVE data. Administrators should monitor the Israeli Government CVE Advisories and Maxum vendor communications for official patch releases. Given the critical severity of this vulnerability, applying patches immediately upon availability is strongly recommended.

Workarounds

• Implement network segmentation to limit exposure of Rumpus servers to untrusted networks
• Deploy a reverse proxy or web application firewall (WAF) in front of Rumpus to filter malicious inputs
• Restrict access to Rumpus services through IP whitelisting and VPN requirements
• Monitor server logs closely for exploitation attempts while awaiting an official patch