CVE-2025-23120: Veeam Backup & Replication RCE Flaw

CVE-2025-23120 Overview

A vulnerability allowing remote code execution (RCE) for domain users.

Critical Impact
This vulnerability allows attackers to execute arbitrary code remotely, potentially leading to full system compromise.

Affected Products

Veeam Backup & Replication

Discovery Timeline

Not Available - Vulnerability discovered by Not Available
Not Available - Responsible disclosure to Veeam
Not Available - CVE CVE-2025-23120 assigned
Not Available - Veeam releases security patch
2025-03-20 - CVE CVE-2025-23120 published to NVD
2025-04-02 - Last updated in NVD database

Technical Details for CVE-2025-23120

Vulnerability Analysis

The vulnerability exists due to improper input validation, allowing unauthenticated remote attackers to execute arbitrary code on vulnerable installations of Veeam Backup & Replication.

Root Cause

The root cause is insecure deserialization, specifically related to CWE-502, where serialized data is not properly validated before being deserialized.

Attack Vector

Attackers can exploit the vulnerability over the network without the need for authentication, making it a critical threat.

python

# Example exploitation code (sanitized)
def exploit(target_ip):
    payload = create_malicious_data()
    send_payload(target_ip, payload)

Detection Methods for CVE-2025-23120

Indicators of Compromise

Unexpected network traffic to known Veeam servers
New or unknown processes executing without user initiation
Changes in system file integrity

Detection Strategies

Utilize network monitoring tools to identify unexpected data packets or anomalous traffic patterns originating from or directed to Veeam Backup & Replication servers.

Monitoring Recommendations

Continuous monitoring for process creation and network connections detected through security information and event management (SIEM) systems.

How to Mitigate CVE-2025-23120

Immediate Actions Required

Update Veeam Backup & Replication to the latest patch
Enable network segmentation to limit access
Regularly review and apply security updates

Patch Information

For patch details, consult the Veeam advisory KB4724.

Workarounds

Restrict network access to only trusted sources and disable unnecessary services that are not actively in use.

bash

# Configuration example
iptables -A INPUT -p tcp --dport 9393 -s trusted_ip -j ACCEPT
iptables -A INPUT -p tcp --dport 9393 -j DROP