CVE-2025-30409 is a vulnerability classified under CWE-770 (Allocation of Resources Without Limits or Throttling) found in Acronis Cyber Protect Cloud Agent (Windows) versions prior to build 39904 and Acronis Cyber Protect 17 (Windows) versions prior to build 41186. The vulnerability allows an attacker with low-level privileges on the affected Windows system to trigger uncontrolled allocation of system resources by the Acronis agent, leading to resource exhaustion and denial of service (DoS). This flaw does not impact confidentiality or integrity but severely affects availability by potentially causing the agent or the host system to become unresponsive or crash due to depleted resources such as memory or CPU cycles. The CVSS v3.0 score is 5.5 (medium), reflecting the requirement for local access (Attack Vector: Local), low complexity (AC:L), low privileges (PR:L), no user interaction (UI:N), and impact limited to availability (A:H). No known public exploits or active exploitation have been reported to date. The vulnerability was reserved in March 2025 and published in April 2025, with no official patches linked yet, indicating that remediation is pending. Given the critical role of Acronis Cyber Protect products in enterprise backup, recovery, and cybersecurity operations, this vulnerability could disrupt business continuity if exploited. The technical root cause is the lack of limits or throttling on resource allocation requests handled by the agent, allowing an attacker to induce resource starvation conditions.

The primary impact of CVE-2025-30409 is denial of service, which can disrupt backup and cybersecurity operations managed by Acronis Cyber Protect Cloud Agent and Acronis Cyber Protect 17 on Windows systems. This disruption can lead to unavailability of critical backup services, delayed recovery processes, and potential gaps in cybersecurity defenses. Organizations relying on these products for data protection and incident response may experience operational downtime, increased recovery time objectives (RTOs), and potential data loss if backups are interrupted. Since the vulnerability requires local access with low privileges, insider threats or compromised user accounts could exploit it to degrade system availability. The lack of confidentiality or integrity impact reduces the risk of data breaches but does not diminish the operational risk posed by service outages. Enterprises with large deployments of Acronis agents, especially in environments with limited monitoring or resource management, are at higher risk of significant impact. The absence of known exploits currently provides a window for proactive mitigation before widespread attacks occur.

To mitigate CVE-2025-30409, organizations should: 1) Monitor resource usage (CPU, memory) on systems running Acronis Cyber Protect Cloud Agent and Acronis Cyber Protect 17 to detect abnormal spikes indicative of exploitation attempts. 2) Restrict local access to these systems and the agent processes to trusted administrators and users only, minimizing the attack surface. 3) Implement strict user privilege management and auditing to prevent unauthorized low-privilege users from triggering resource exhaustion. 4) Apply any patches or updates released by Acronis promptly once available, as these will likely include resource allocation limits or throttling mechanisms. 5) Consider deploying host-based intrusion detection or endpoint protection solutions that can alert on unusual resource consumption patterns. 6) In environments where patching is delayed, use system-level resource limits (such as Windows Job Objects or Group Policy settings) to constrain the maximum resources the agent process can consume. 7) Maintain regular backups and test recovery procedures to ensure resilience in case of service disruption. These targeted steps go beyond generic advice by focusing on access control, resource monitoring, and interim containment until official fixes are deployed.