CVE-2025-3928
📋 TL;DR
CVE-2025-3928 is a vulnerability in Commvault Web Server that allows authenticated remote attackers to create and execute webshells, potentially leading to complete system compromise. This affects all Commvault Web Server installations running vulnerable versions. The vulnerability is actively exploited and listed in CISA's Known Exploited Vulnerabilities catalog.
💻 Affected Systems
- Commvault Web Server
📦 What is this software?
Commvault by Commvault
Commvault by Commvault
Commvault by Commvault
Commvault by Commvault
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the Commvault server, data exfiltration, ransomware deployment, and lateral movement to connected systems.
Likely Case
Unauthorized access to backup data, deployment of persistent backdoors, and potential credential theft from the Commvault environment.
If Mitigated
Limited impact due to network segmentation, strong authentication controls, and monitoring preventing successful exploitation.
🎯 Exploit Status
Actively exploited in the wild per CISA KEV catalog. Requires authenticated access but exploitation appears straightforward based on advisory description.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 11.36.46, 11.32.89, 11.28.141, or 11.20.217 depending on your version track
Vendor Advisory: https://documentation.commvault.com/securityadvisories/CV_2025_03_1.html
Restart Required: Yes
Instructions:
1. Identify current Commvault version. 2. Download appropriate patch from Commvault support portal. 3. Apply patch following Commvault upgrade procedures. 4. Restart Commvault services. 5. Verify successful update.
🔧 Temporary Workarounds
Network Segmentation
allRestrict access to Commvault Web Server to only trusted administrative networks
Enhanced Authentication Controls
allImplement multi-factor authentication and strong password policies for Commvault administrative accounts
🧯 If You Can't Patch
- Implement strict network access controls to limit who can reach the Commvault Web Server
- Enable detailed logging and monitoring for webshell creation and execution attempts
🔍 How to Verify
Check if Vulnerable:
Check Commvault version via CommCell Console or command line. Vulnerable if version is below the patched versions listed.Check Version:
On Commvault server: qoperation execscript -sn GetVersionInfo (Windows/Linux)Verify Fix Applied:
Verify version shows 11.36.46, 11.32.89, 11.28.141, or 11.20.217 or higher in CommCell Console.📡 Detection & Monitoring
Log Indicators:
- Unusual file creation in web directories
- Suspicious process execution from web server context
- Unexpected authentication patterns
Network Indicators:
- Unusual outbound connections from Commvault server
- Webshell communication patterns
- Anomalous HTTP requests to Commvault web interface
SIEM Query:
source="commvault" AND (event="file_create" OR event="process_execute") AND (path="*.jsp" OR path="*.php" OR path="*.asp" OR path="*.aspx")🔗 References
- https://documentation.commvault.com/securityadvisories/CV_2025_03_1.html
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2025-3928
- https://www.cisa.gov/news-events/alerts/2025/05/22/advisory-update-cyber-threat-activity-targeting-commvaults-saas-cloud-application-metallic
- https://www.commvault.com/blogs/customer-security-update
- https://www.commvault.com/blogs/notice-security-advisory-update
- https://www.commvault.com/blogs/security-advisory-march-7-2025
- https://www.bleepingcomputer.com/news/security/commvault-says-recent-breach-didnt-impact-customer-backup-data/
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-3928
