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HIGH · CVSS 8.8 CISA Known Exploited Vulnerability

CVE-2025-3928

Commvault Web Server Unspecified Vulnerability

Commvault Web Server

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.

CVSS
8.8
HIGH
EPSS
2.5%
30-day exploitation
Ransomware groups
0
recorded exploiting
Published
25 Apr 2025
NVD

Exploitation status

CISA Known Exploited Vulnerabilities

Listed by CISA on 28 April 2025. US federal agencies were required to remediate it by 19 May 2025.

EPSS — exploitation probability

FIRST puts the probability of exploitation activity in the next 30 days at 2.5%, which is higher than 85% of all scored vulnerabilities. EPSS is a forecast of activity, not a measure of severity, and it is rescored daily.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Frequently asked questions

Is CVE-2025-3928 being exploited by ransomware groups?

No ransomware group in this database is currently recorded as exploiting CVE-2025-3928.

What does CVE-2025-3928 affect?

CVE-2025-3928 affects Commvault Web Server. 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.

How severe is CVE-2025-3928?

CVE-2025-3928 is rated HIGH with a CVSS base score of 8.8. EPSS puts the probability of exploitation in the next 30 days at 2.5%, higher than 85% of all scored vulnerabilities. It is listed in the CISA Known Exploited Vulnerabilities catalog, with a federal remediation deadline of 19 May 2025.

How should organisations respond to CVE-2025-3928?

Apply the vendor patch for Commvault Web Server as the first priority, and treat any internet-facing instance as the most urgent. Because this vulnerability is associated with ransomware activity, also review whether the affected systems were reachable before patching, rather than assuming that patching alone closes the incident.