CVE-2025-57789
📋 TL;DR
This vulnerability allows remote attackers to gain administrative control of affected systems by exploiting default credentials during the brief setup window between installation and first administrator login. Only systems in the initial configuration phase before any jobs are configured are vulnerable. Organizations deploying new instances of affected software are at risk.
💻 Affected Systems
- Commvault software
📦 What is this software?
Commvault by Commvault
⚠️ Risk & Real-World Impact
Worst Case
Complete administrative compromise of the system, allowing attackers to configure malicious jobs, exfiltrate data, or establish persistence.
Likely Case
Temporary administrative access during setup phase, potentially allowing configuration of unauthorized jobs or initial foothold.
If Mitigated
No impact if systems are properly configured before exposure or if default credentials are changed immediately.
🎯 Exploit Status
Exploitation requires timing to catch systems during the brief setup window.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor advisory for specific fixed versions
Vendor Advisory: https://documentation.commvault.com/securityadvisories/CV_2025_08_4.html
Restart Required: No
Instructions:
1. Update to the latest patched version from Commvault. 2. Ensure all new installations complete initial configuration immediately. 3. Change default credentials before exposing systems to networks.
🔧 Temporary Workarounds
Immediate credential change
allChange default administrator credentials immediately after installation before exposing to any network
Isolated setup environment
allPerform initial installation and configuration in an isolated network environment
🧯 If You Can't Patch
- Ensure all installations complete initial configuration and credential change before network exposure
- Implement network segmentation to restrict access to systems during setup phase
🔍 How to Verify
Check if Vulnerable:
Check if system is in initial setup phase (no jobs configured) and default credentials are still activeCheck Version:
Check Commvault documentation for version verification commands specific to your deploymentVerify Fix Applied:
Verify system has completed initial configuration, jobs are configured, and default credentials have been changed📡 Detection & Monitoring
Log Indicators:
- Authentication attempts using default credentials
- Administrative actions during initial setup window
Network Indicators:
- Unexpected administrative access from unauthorized sources during setup phase
SIEM Query:
Authentication events with default credentials OR administrative actions from new installations before job configuration