CVE-2025-48983 is a critical vulnerability discovered in the Mount service component of Veeam Backup & Replication version 12.3.2. This flaw permits remote code execution (RCE) on backup infrastructure hosts by an authenticated domain user, meaning that an attacker with valid domain credentials can exploit this vulnerability to run arbitrary code with elevated privileges on the backup server. The vulnerability does not require user interaction and has a low attack complexity, making it highly exploitable once credentials are obtained. The vulnerability affects the core backup infrastructure, which is responsible for data protection and recovery operations, thereby threatening the confidentiality, integrity, and availability of backup data and potentially the entire IT environment. The CVSS v3.1 score of 10 reflects the critical severity, with attack vector being network-based, privileges required being low (authenticated user), and scope being changed, indicating that the vulnerability can affect resources beyond the initially compromised component. Although no known exploits have been reported in the wild as of the publication date, the critical nature of this vulnerability and the widespread use of Veeam Backup & Replication in enterprise environments make it a high-priority security concern. The vulnerability was reserved in May 2025 and published in October 2025, but no patch links are currently provided, emphasizing the need for vigilance and proactive mitigation by affected organizations.

For European organizations, the impact of CVE-2025-48983 is significant due to the critical role Veeam Backup & Replication plays in enterprise data protection and disaster recovery. Successful exploitation could lead to full compromise of backup servers, allowing attackers to manipulate or destroy backup data, disable recovery capabilities, or use the compromised backup infrastructure as a pivot point to infiltrate other parts of the network. This threatens business continuity, data integrity, and regulatory compliance, especially under strict data protection laws like GDPR. Organizations in sectors such as finance, healthcare, government, and critical infrastructure are particularly vulnerable due to their reliance on secure and reliable backup systems. The ability for an authenticated domain user to execute code remotely also raises concerns about insider threats or compromised credentials being leveraged to cause widespread damage. The lack of current public exploits does not diminish the urgency, as attackers may develop exploits rapidly given the vulnerability's criticality and ease of exploitation.

1. Immediately monitor for any updates or patches released by Veeam and apply them as soon as they become available. 2. Restrict domain user permissions rigorously, ensuring that only trusted and necessary accounts have access to backup infrastructure hosts. 3. Implement strict network segmentation to isolate backup servers from general user networks and limit lateral movement opportunities. 4. Employ multi-factor authentication (MFA) for all domain accounts, especially those with access to backup systems, to reduce the risk of credential compromise. 5. Continuously monitor backup infrastructure logs and network traffic for unusual activities indicative of exploitation attempts, such as unexpected process executions or network connections. 6. Conduct regular security audits and penetration tests focusing on backup environments to identify and remediate potential weaknesses. 7. Educate IT and security teams about this vulnerability and the importance of safeguarding backup systems. 8. Prepare incident response plans specifically addressing backup system compromises to enable rapid containment and recovery.