CVE-2025-48983 Overview
A vulnerability exists in the Mount service of Veeam Backup & Replication that allows authenticated domain users to achieve remote code execution (RCE) on backup infrastructure hosts. This vulnerability affects a critical enterprise backup solution, potentially allowing attackers with valid domain credentials to compromise the entire backup infrastructure and gain control over backup servers.
Critical Impact
Authenticated domain users can execute arbitrary code on backup infrastructure hosts, potentially compromising backup data integrity and enabling lateral movement across the enterprise environment.
Affected Products
- Veeam Backup & Replication
Discovery Timeline
- 2025-10-31 - CVE-2025-48983 published to NVD
- 2025-12-01 - Last updated in NVD database
Technical Details for CVE-2025-48983
Vulnerability Analysis
This vulnerability resides in the Mount service component of Veeam Backup & Replication. The flaw enables authenticated domain users to execute arbitrary code remotely on backup infrastructure hosts. The vulnerability is classified under CWE-284 (Improper Access Control), indicating that the Mount service fails to properly restrict access or validate authorization for certain operations.
The vulnerability is particularly dangerous because it requires only low-privilege authentication (domain user credentials) while enabling complete compromise of backup infrastructure hosts. The scope is changed, meaning successful exploitation can affect resources beyond the vulnerable component itself, potentially impacting the confidentiality, integrity, and availability of the entire backup infrastructure.
Root Cause
The root cause of this vulnerability is improper access control (CWE-284) within the Mount service component. The service fails to adequately validate or restrict operations that authenticated domain users can perform, allowing them to execute code on backup infrastructure hosts without appropriate authorization checks.
Attack Vector
The attack is network-based and requires the attacker to have valid domain user credentials. The exploitation complexity is low, meaning no special conditions or circumstances are needed beyond network access and authentication. The attacker does not require any user interaction to exploit this vulnerability.
Once authenticated to the domain, an attacker can target the Mount service to execute arbitrary code on backup infrastructure hosts. This could enable data exfiltration from backups, ransomware deployment targeting backup data, or lateral movement to other systems in the environment.
Detection Methods for CVE-2025-48983
Indicators of Compromise
- Unusual process spawning from Veeam Mount service processes
- Unexpected network connections from backup infrastructure hosts to external or unusual internal destinations
- Anomalous authentication events from domain users accessing the Mount service
- Suspicious command execution or PowerShell activity on backup servers
Detection Strategies
- Monitor Veeam Backup & Replication logs for unusual Mount service operations or errors
- Implement network segmentation monitoring to detect unexpected traffic patterns from backup infrastructure
- Deploy endpoint detection on backup servers to identify anomalous process behavior
- Configure SIEM rules to correlate domain authentication events with Mount service activity
Monitoring Recommendations
- Enable verbose logging on Veeam Backup & Replication servers
- Establish baseline behavior for Mount service operations and alert on deviations
- Monitor for privilege escalation attempts or lateral movement from backup infrastructure hosts
- Review domain user access patterns to backup infrastructure regularly
How to Mitigate CVE-2025-48983
Immediate Actions Required
- Apply the security patch from Veeam immediately by following the guidance in Veeam Knowledge Base Article KB4771
- Restrict network access to backup infrastructure hosts to only authorized systems
- Review and audit domain user permissions related to Veeam Backup & Replication
- Implement network segmentation to isolate backup infrastructure from general user networks
Patch Information
Veeam has released a security update to address this vulnerability. Administrators should consult the Veeam Knowledge Base Article KB4771 for detailed patching instructions and affected version information. Applying the vendor-supplied patch is the recommended remediation approach.
Workarounds
- Implement strict network access controls to limit which systems can communicate with the Mount service
- Restrict domain user access to backup infrastructure using Active Directory group policies
- Consider temporarily disabling the Mount service if not required for business operations until patching is complete
- Deploy additional monitoring and alerting on backup infrastructure hosts to detect potential exploitation attempts
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
