CVE-2020-25020 is a critical security vulnerability classified as an XML External Entity (XXE) attack vector affecting MPXJ library versions through 8.1.3. MPXJ is a Java library used to read project files from various project management software. The vulnerability specifically impacts the GanttProjectReader and PhoenixReader components, which parse XML data from project files. XXE vulnerabilities arise when XML parsers process external entity references without proper validation or restrictions, allowing attackers to read arbitrary files, perform server-side request forgery (SSRF), or cause denial of service (DoS) by exploiting XML parser features. In this case, an attacker can craft malicious project files containing external entity references that, when processed by the vulnerable MPXJ components, lead to unauthorized disclosure of sensitive information, potential system compromise, or service disruption. The CVSS v3.1 base score of 9.8 reflects the high severity, with network attack vector, no required privileges or user interaction, and full impact on confidentiality, integrity, and availability. Although no known exploits in the wild have been reported, the vulnerability poses a significant risk due to the ease of exploitation and the critical nature of the affected components in project management workflows. No vendor or product-specific patch information is provided, indicating that users must verify their MPXJ library versions and apply any available updates or mitigations from the maintainers.

For European organizations, this vulnerability can have severe consequences, especially for those relying on MPXJ-integrated tools for project management and planning. Confidential project data, including timelines, resource allocations, and strategic plans, could be exposed or manipulated, leading to competitive disadvantage or regulatory non-compliance under GDPR. Integrity and availability impacts could disrupt project workflows, causing operational delays and financial losses. Organizations in sectors such as construction, engineering, IT services, and government agencies that utilize project management software parsing MPXJ libraries are particularly at risk. The network-based exploitation means attackers can remotely target vulnerable systems without authentication, increasing the threat surface. Additionally, the lack of user interaction requirement facilitates automated attacks, potentially enabling widespread exploitation if unmitigated. The absence of known exploits in the wild does not diminish the urgency for European entities to address this vulnerability proactively to prevent potential data breaches or service outages.

European organizations should immediately identify all instances where MPXJ library versions up to 8.1.3 are in use, focusing on applications that utilize the GanttProjectReader and PhoenixReader components. They should consult MPXJ maintainers or official repositories for any patches or updated versions that address CVE-2020-25020 and apply them promptly. If patches are unavailable, organizations should consider implementing XML parser hardening by disabling external entity processing and DTDs in the XML parsers used by these components. Employing XML security best practices such as using secure XML parsing libraries, input validation, and sandboxing the parsing process can reduce risk. Network-level mitigations include restricting inbound traffic to project management systems and monitoring for anomalous XML payloads indicative of XXE attacks. Regular security assessments and code reviews of applications integrating MPXJ can help detect and remediate insecure XML processing. Finally, organizations should maintain robust incident response plans to quickly address any exploitation attempts.