CISA Issues Warning on Commvault Web Server Flaw Exploited in the Wild

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has issued an urgent alert concerning a newly disclosed security flaw in the Commvault Web Server.

This vulnerability, now tracked as CVE-2025-3928, could allow remote, authenticated attackers to gain unauthorized access to systems, raising concerns across organizations worldwide that use Commvault’s data protection solutions.

CVE-2025-3928: Unspecified Vulnerability Sparks Concern

The Commvault Web Server has been found to contain an unspecified vulnerability, enabling attackers with authenticated access to create and execute webshells on affected servers.

While detailed technical information remains limited, experts warn that exploitation could lead to full system compromise, including unauthorized access, data theft, or deploying additional malicious payloads.

One of the more alarming factors is that the attack does not require privileged administrative rights; instead, any authenticated remote user could potentially leverage the flaw.

Currently, there is no public evidence linking this vulnerability to active ransomware campaigns, but the possibility cannot be ruled out, especially given the nature of webshell attacks historically tied to ransomware operators.

On April 28, 2025, CISA added CVE-2025-3928 to its Known Exploited Vulnerabilities (KEV) catalog, urging rapid action from federal and private sector organizations.

The agency’s advisory underscores the severity of the threat, emphasizing the need for immediate remediation.

CISA’s recommended actions are as follows:

• Apply Vendor Mitigations: Organizations should implement patches or workaround instructions provided by Commvault as soon as they become available. Regularly check for updates to vendor advisories.
• Follow Applicable Guidance: Agencies and businesses should adhere to Binding Operational Directive (BOD) 22-01 for cloud services, ensuring security protocols and monitoring are up to date.
• Discontinue Use if Unpatched: If mitigations or patches are unavailable, CISA recommends discontinuing use of the vulnerable Commvault Web Server to avoid risk until a fix is implemented.

The deadline for addressing this vulnerability is May 17, 2025. CISA has highlighted that failure to act within this timeframe could expose networks to a significant risk of compromise.

Commvault, a leading provider of enterprise backup and recovery solutions, is reportedly working on a patch and has urged its customers to monitor official channels for updates.

In the interim, users are advised to audit system access, monitor for indicators of compromise, and support security controls around the Commvault environment.

Security analysts warn that as attackers move quickly to exploit newly disclosed flaws, immediate action is paramount.

Organizations should prioritize this vulnerability in their patching cycles and review system logs for suspicious activity.

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