CVE-2025-59895 Overview
CVE-2025-59895 is a remote denial-of-service (DoS) vulnerability affecting Sync Breeze Enterprise Server v10.4.18 and Disk Pulse Enterprise v10.4.18. The vulnerability exists in the configuration restore functionality due to insufficient validation of user-supplied data. An attacker can exploit this flaw by sending malicious requests to alter the configuration file, causing the application to become unresponsive. In severe cases, the corrupted configuration prevents the service from restarting, potentially requiring a complete reinstallation to recover.
Critical Impact
Successful exploitation renders the affected service unresponsive and may require complete reinstallation due to corrupted configuration files that prevent manual service recovery.
Affected Products
- Sync Breeze Enterprise Server v10.4.18
- Disk Pulse Enterprise v10.4.18
- Flexense Enterprise Products with Configuration Restore Functionality
Discovery Timeline
- 2026-01-28 - CVE-2025-59895 published to NVD
- 2026-01-29 - Last updated in NVD database
Technical Details for CVE-2025-59895
Vulnerability Analysis
This vulnerability is classified under CWE-20 (Improper Input Validation), indicating that the affected applications fail to properly validate, filter, or sanitize input data during the configuration restore process. The configuration restore functionality accepts user-supplied data without adequate boundary checks or format validation, allowing attackers to inject malformed configuration data that corrupts the application's operational state.
The network-accessible nature of this vulnerability means attackers can exploit it remotely without requiring authentication. While the vulnerability does not compromise data confidentiality or integrity, it severely impacts system availability. The corruption of configuration files creates a persistent denial-of-service condition that survives application restart attempts, distinguishing this from typical transient DoS vulnerabilities.
Root Cause
The root cause stems from improper input validation (CWE-20) in the configuration restore functionality. The application processes user-supplied configuration data without sufficient sanitization or structural validation. When malformed data is submitted during the restore operation, it gets written directly to the configuration files, corrupting them in a way that prevents the application from initializing correctly on subsequent startup attempts.
Attack Vector
The attack vector is network-based, allowing remote exploitation. An attacker targets the configuration restore endpoint and submits specially crafted malicious requests containing malformed configuration data. The vulnerability does not require user interaction or prior authentication in the default configuration.
The exploitation flow involves:
- An attacker identifies the configuration restore endpoint on the target server
- Malicious requests containing crafted configuration data are sent to the endpoint
- The application processes the invalid data without proper validation
- Configuration files become corrupted, preventing service operation
- The service fails to restart and may require complete reinstallation
Detection Methods for CVE-2025-59895
Indicators of Compromise
- Unexpected modifications to configuration files in the Sync Breeze or Disk Pulse installation directories
- Service failures or crashes immediately following configuration restore operations
- Unusual network requests targeting the configuration management endpoints
- Application event logs showing configuration parsing errors or initialization failures
Detection Strategies
- Monitor network traffic for unusual requests to configuration restore endpoints on Sync Breeze and Disk Pulse servers
- Implement file integrity monitoring on configuration files to detect unauthorized modifications
- Configure alerting for service restarts that fail repeatedly or require manual intervention
- Review web server access logs for anomalous POST requests to configuration-related URLs
Monitoring Recommendations
- Deploy network-based intrusion detection rules to identify exploitation attempts targeting configuration endpoints
- Enable verbose logging for the configuration restore functionality to capture detailed request information
- Establish baseline configuration file checksums and alert on unexpected changes
- Monitor service health metrics to quickly identify availability degradation
How to Mitigate CVE-2025-59895
Immediate Actions Required
- Restrict network access to the configuration restore functionality using firewall rules or access control lists
- Disable the configuration restore feature if not actively required for operations
- Implement network segmentation to limit exposure of management interfaces to trusted networks only
- Back up current configuration files to enable rapid recovery if exploitation occurs
Patch Information
Organizations should monitor Flexense for official security patches addressing this vulnerability. Refer to the INCIBE Security Notice for additional details on affected products and recommended actions from the security researchers who disclosed this vulnerability.
Workarounds
- Deploy a web application firewall (WAF) to filter malicious requests targeting configuration endpoints
- Implement strict input validation at the network perimeter for requests to affected services
- Configure the application to run with minimal privileges to limit the impact of exploitation
- Establish automated configuration backup procedures to enable rapid recovery from corruption events
# Example: Restrict access to configuration endpoints via iptables
# Allow only trusted management subnet to access the service port
iptables -A INPUT -p tcp --dport 80 -s 10.0.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
# Create a backup of current configuration files
cp -r /path/to/syncbreeze/config /backup/syncbreeze-config-$(date +%Y%m%d)
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
