CVE-2025-30415 Overview
CVE-2025-30415 is a denial of service vulnerability affecting Acronis Cyber Protect Cloud Agent and Acronis Cyber Protect 17. The flaw stems from improper handling of malformed input [CWE-1286], allowing remote attackers to disrupt service availability without authentication or user interaction. Acronis addressed the issue in Cloud Agent build 40077 and Cyber Protect 17 build 41186.
Critical Impact
An unauthenticated network attacker can trigger a denial of service condition against affected Acronis agents, disrupting backup and protection operations across Linux, macOS, and Windows endpoints.
Affected Products
- Acronis Cyber Protect Cloud Agent for Linux, macOS, and Windows before build 40077
- Acronis Cyber Protect 17 for Linux, macOS, and Windows before build 41186
- Endpoints running vulnerable Acronis agents exposed to network input
Discovery Timeline
- 2025-06-04 - CVE-2025-30415 published to NVD
- 2026-04-15 - Last updated in NVD database
Technical Details for CVE-2025-30415
Vulnerability Analysis
The vulnerability resides in input parsing logic within Acronis Cyber Protect agents. The affected components fail to validate semantic correctness of consumed input as described in [CWE-1286]. When the agent receives malformed data over the network, the parsing routine enters an error state that terminates or hangs the service process.
This affects availability of the backup agent. Disruption prevents scheduled backups, recovery operations, and endpoint protection functions from running. Organizations relying on Acronis for ransomware protection lose coverage while the agent is unavailable.
The issue carries an EPSS probability of 0.319% at the 54.96 percentile as of May 2026, indicating modest predicted exploitation likelihood. No public proof-of-concept code has been published, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog.
Root Cause
The root cause is improper validation of input syntax against expected structure [CWE-1286]. The agent accepts network input but does not enforce strict conformance to its protocol grammar. Malformed fields propagate into parsing logic that lacks defensive error handling, causing the service to crash or stall.
Attack Vector
The attack vector is network-based and requires no authentication or user interaction. An attacker sends crafted malformed input to a listening Acronis agent endpoint. The agent processes the input, encounters the parsing fault, and enters a denial of service state. See the Acronis Security Advisory SEC-8646 for technical details.
// No verified exploit code is publicly available for CVE-2025-30415.
// Refer to the Acronis Security Advisory SEC-8646 for technical guidance.
Detection Methods for CVE-2025-30415
Indicators of Compromise
- Unexpected termination or restart of Acronis Cyber Protect agent services on Linux, macOS, or Windows hosts
- Repeated agent process crashes recorded in system event logs without corresponding administrative action
- Failed or skipped backup jobs coinciding with anomalous inbound network traffic to the agent
Detection Strategies
- Monitor agent service health and restart counts across the fleet, alerting on clusters of failures
- Inspect network traffic to Acronis agent listening ports for malformed protocol payloads or unusual senders
- Correlate backup job failures with host crash logs to identify systematic disruption patterns
Monitoring Recommendations
- Enable centralized log forwarding from Acronis agents to a SIEM for crash and error events
- Track build versions across endpoints and alert when builds older than 40077 (Cloud Agent) or 41186 (Cyber Protect 17) are detected
- Baseline normal agent network communication to surface anomalous inbound connections
How to Mitigate CVE-2025-30415
Immediate Actions Required
- Upgrade Acronis Cyber Protect Cloud Agent to build 40077 or later on all Linux, macOS, and Windows hosts
- Upgrade Acronis Cyber Protect 17 to build 41186 or later across the environment
- Restrict network reachability of Acronis agent listening ports to trusted management infrastructure only
Patch Information
Acronis released fixed builds addressing CVE-2025-30415. Update Cloud Agent to build 40077 and Cyber Protect 17 to build 41186. Full remediation details are available in the Acronis Security Advisory SEC-8646.
Workarounds
- Apply firewall rules limiting inbound connections to Acronis agent ports to authorized management servers
- Segment networks containing backup agents from untrusted user and guest networks
- Increase service watchdog frequency to recover the agent quickly if a crash occurs before patching is complete
# Example: restrict inbound access to Acronis agent ports on Linux hosts
# Replace 10.0.0.0/24 with your authorized management subnet
sudo iptables -A INPUT -p tcp --dport 7780 -s 10.0.0.0/24 -j ACCEPT
sudo iptables -A INPUT -p tcp --dport 7780 -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
