CVE-2022-3364 is a medium-severity vulnerability classified under CWE-770, which pertains to the allocation of resources without limits or throttling. This vulnerability affects the ikus060/rdiffweb project, an open-source web interface for rdiff-backup, prior to version 2.5.0a3. The core issue is that the application does not impose adequate restrictions on resource allocation, potentially allowing an unauthenticated remote attacker to trigger excessive consumption of system resources such as memory or CPU. The CVSS 3.0 base score is 5.3, reflecting a network attack vector with low complexity, no privileges required, and no user interaction needed. The impact is limited to availability, as confidentiality and integrity are not affected. Exploiting this vulnerability could lead to denial of service (DoS) conditions by exhausting server resources, causing the rdiffweb service to become unresponsive or crash. There are no known exploits in the wild, and no official patches or mitigation links were provided at the time of publication. The vulnerability is relevant to any deployment of the rdiffweb software, especially those exposed to untrusted networks or the internet without adequate protections.

For European organizations using ikus060/rdiffweb, this vulnerability poses a risk primarily to service availability. Organizations relying on rdiffweb for backup management or file synchronization could experience service interruptions if an attacker exploits this resource allocation flaw. This could disrupt backup operations, delay data recovery processes, and potentially impact business continuity. The risk is heightened for organizations with public-facing rdiffweb instances or those lacking network-level protections such as firewalls or rate limiting. While the vulnerability does not compromise data confidentiality or integrity, the denial of service could indirectly affect operational efficiency and incident response capabilities. Given the medium severity and absence of known exploits, the immediate risk is moderate but should not be ignored, especially in critical infrastructure or sectors with stringent uptime requirements.

To mitigate CVE-2022-3364, European organizations should first ensure they upgrade to rdiffweb version 2.5.0a3 or later, where the vulnerability is addressed. In the absence of an official patch, organizations should implement network-level controls such as rate limiting and IP filtering to restrict access to the rdiffweb interface, especially from untrusted sources. Deploying web application firewalls (WAFs) that can detect and block abnormal request patterns may help prevent resource exhaustion attacks. Additionally, monitoring resource usage metrics on servers hosting rdiffweb can provide early detection of potential exploitation attempts. Organizations should also consider isolating rdiffweb services within segmented network zones and enforcing strict access controls. Regularly reviewing logs for unusual activity and conducting penetration testing focused on resource exhaustion scenarios can further enhance defenses. Finally, maintaining an incident response plan that includes recovery procedures for DoS events will improve resilience.