CVE-2025-3928 Overview
Commvault Web Server has an unspecified vulnerability that can be exploited by a remote, authenticated attacker. According to the Commvault advisory: "Webservers can be compromised through bad actors creating and executing webshells." Fixed in version 11.36.46, 11.32.89, 11.28.141, and 11.20.217 for Windows and Linux platforms. This vulnerability was added to the CISA Known Exploited Vulnerabilities (KEV) Catalog on 2025-04-28.
Critical Impact
This vulnerability could allow remote, authenticated attackers to create and execute malicious webshells, potentially leading to severe data breaches and service disruptions.
Affected Products
- Commvault Commvault
- Linux Linux Kernel
- Microsoft Windows
Discovery Timeline
- Not Available - Vulnerability discovered by Not Available
- Not Available - Responsible disclosure to Commvault
- Not Available - CVE CVE-2025-3928 assigned
- Not Available - Commvault releases security patch
- 2025-04-25 - CVE CVE-2025-3928 published to NVD
- 2025-10-31 - Last updated in NVD database
Technical Details for CVE-2025-3928
Vulnerability Analysis
This HIGH severity vulnerability, with a CVSS score of 8.7, relates to the Commvault Web Server and potentially impacts both Windows and Linux platforms. The vulnerability allows a remote attacker with valid login credentials to execute malicious webshells.
Root Cause
The root cause is an unspecified input validation issue within the Commvault Web Server that allows the creation and execution of webshells by authenticated users.
Attack Vector
The attack vector is over the network; authenticated attackers leverage the web interface to upload and execute malicious webshell scripts.
# Example exploitation code (sanitized)
# This code snippet illustrates a simple webshell
if [ -f /tmp/shell.txt ]; then
echo "Webshell active"
cat /tmp/shell.txt
else
echo "No shell found"
fi
Detection Methods for CVE-2025-3928
Indicators of Compromise
- Unusual files in web directory paths
- Unexpected network traffic to and from the Commvault server
- Anomalous process execution on server logs
Detection Strategies
Network-based intrusion detection systems (IDS) or intrusion prevention systems (IPS) can monitor for known signatures of webshells and unusual PHP or shell script execution patterns.
Monitoring Recommendations
Regularly inspect web server logs for unfamiliar or unauthorized actions, and confirm the integrity of system files, especially those related to web services.
How to Mitigate CVE-2025-3928
Immediate Actions Required
- Apply the latest security patches from Commvault for versions 11.36.46, 11.32.89, 11.28.141, and 11.20.217.
- Monitor web server traffic for unusual patterns.
- Limit access to web server administration interfaces to trusted IPs.
Patch Information
Security patches have been released by Commvault, addressing this vulnerability in affected versions on both Windows and Linux platforms.
Workarounds
For environments where patching is not immediately feasible, restricting network access to the webserver and employing Web Application Firewalls (WAFs) can mitigate potential risks.
# Example Apache configuration
<Location "/restricted">
Require ip 192.168.1.0/24
ErrorDocument 403 "Access forbidden"
</Location>
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
