CVE-2025-30409 is a medium-severity vulnerability classified under CWE-770, which pertains to the allocation of resources without limits, leading to a denial of service (DoS) condition. This vulnerability affects the Acronis Cyber Protect Cloud Agent for Windows, specifically versions before build 39904. The flaw arises because the agent improperly manages resource allocation, allowing an attacker to trigger excessive consumption of system resources such as memory or CPU cycles. This uncontrolled allocation can exhaust available resources, causing the agent or the host system to become unresponsive or crash, thereby disrupting backup and protection services provided by the agent. The vulnerability does not require authentication or user interaction, increasing its potential for exploitation in network environments where the agent is reachable. Although no known exploits are currently reported in the wild, the vulnerability's nature suggests that an attacker with network access to the agent could induce a denial of service, impacting system availability. The lack of a patch link indicates that remediation may still be pending or that users must update to a fixed build (39904 or later) once available. The agent is a critical component in Acronis's Cyber Protect Cloud suite, widely used for backup, disaster recovery, and endpoint protection, making this vulnerability significant for organizations relying on these services.

For European organizations, the impact of CVE-2025-30409 primarily concerns availability. A successful exploitation could disrupt backup and recovery operations, potentially leading to data loss or delayed restoration in the event of other incidents. This is particularly critical for sectors with stringent data protection and continuity requirements such as finance, healthcare, and critical infrastructure. Disruption of the Acronis agent could also impair endpoint protection capabilities, increasing exposure to secondary threats. Given the agent’s role in cloud-managed backup services, organizations using Acronis Cyber Protect Cloud Agent in hybrid or cloud environments may experience cascading effects impacting broader IT operations. The medium severity rating reflects that while confidentiality and integrity are not directly compromised, the denial of service could have operational and compliance repercussions. European organizations with large deployments of Acronis agents are at higher risk of operational impact, especially if they lack alternative backup solutions or rapid incident response capabilities.

To mitigate this vulnerability, European organizations should prioritize updating the Acronis Cyber Protect Cloud Agent to build 39904 or later as soon as the patch becomes available. Until then, organizations should implement network-level controls to restrict access to the agent’s management interfaces, limiting exposure to trusted hosts and networks only. Monitoring resource usage on endpoints running the agent can help detect abnormal spikes indicative of exploitation attempts. Employing rate limiting or segmentation to isolate backup agents can reduce the risk of widespread impact. Additionally, organizations should review and test their backup and recovery procedures to ensure resilience in case of agent downtime. Engaging with Acronis support for guidance on interim mitigations and monitoring advisories is recommended. Finally, integrating this vulnerability into vulnerability management and incident response workflows will help maintain situational awareness and readiness.