CVE-2025-3928
CVE-2025-3928 is a security flaw in Commvault Web Server. Attackers are using a flaw in Commvault Web Server that its maker hasn't described in detail. The US Cybersecurity and Infrastructure Security Agency (CISA) added it to its catalog of flaws known to be used in attacks on 28 Apr 2025.[1]
Commvault Web Server is business software or equipment. Most families won’t have it, but attackers break into it to get inside companies, and from there to what those companies hold about their customers, patients and staff. Fixed in version 11.36.46, 11.32.89, 11.28.141 and 11.20.217 of Web Server.
Description
CISA calls it an unspecified in Commvault Web Server. In its words: “Commvault Web Server contains an unspecified vulnerability that allows a remote, authenticated attacker to create and execute webshells.”[1]
The CVE record adds: “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.”[2]
The underlying weakness is code injection (CWE-94), in MITRE’s list of common software weaknesses.
It scores 8.8 out of 10 on the Common Vulnerability Scoring System, which rates it high, scored by NVD using CVSS 3.1.[2]
Affected versions
NVD’s record lists these fixed versions: in each line, everything before the version shown is affected.[2]
| Product | Fixed in |
|---|---|
| Web Server | 11.36.46 |
| Web Server | 11.32.89 |
| Web Server | 11.28.141 |
| Web Server | 11.20.217 |
Most families won’t have Commvault Web Server; it’s for whoever looks after IT at work.
Exploitation
CISA added it to its catalog of known exploited vulnerabilities on 28 Apr 2025, 3 days after it was made public. CISA lists a flaw only when it has reliable evidence of it being exploited, and gave US federal agencies until 19 May 2025 to fix it.[1]
FIRST’s Exploit Prediction Scoring System, which estimates how likely a flaw is to be used in attacks in the next 30 days from what it sees across the internet, puts it at 3%. That’s in the top 16% of the flaws it scores.[4]
CISA assesses it as not automatable: each attack takes some work.
CISA doesn’t say who was attacked, or how.
Fix
Commvault has published a fix or advice.[3] CISA’s required action: “Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.”[1]
- Check whether you use it.Commvault Web Server is business software or equipment, so most families won’t have it. If you run a business, or work from home on company equipment, ask whoever looks after your IT.
- Send this page to your IT person.Ask them to confirm it’s fixed (fixed in version 11.36.46, 11.32.89, 11.28.141 and 11.20.217 of Web Server), or not in use. CISA gave US government agencies until 19 May 2025 to fix it.
- If it can’t be fixed, take it offline.CISA’s advice when there’s no fix is to stop using the product, or take it off the internet, until there is one.
You can’t fix someone else’s server, but you can watch for what follows a break-in like this: a breach notice, a password reset you didn’t ask for, or a scam message that knows things it shouldn’t. HARD watches for those for you and your family.
Timeline
| Date | Event |
|---|---|
| The flaw is made public in the National Vulnerability Database, with a severity score of 8.8.[2] | |
| CISA adds it to its catalog of flaws known to be used in attacks.[1] | |
| CISA’s deadline for US government agencies to fix it.[1] | |
| FIRST puts the odds of it being used in attacks in the next 30 days at 3%.[4] |
See also
Other Commvault flaws
- CVE-2025-34028, Commvault Command Center: path traversal ·
Other code injection flaws
- CVE-2026-0322, Palo Alto Networks PAN-OS: code injection ·
- CVE-2026-65660, Microsoft SharePoint: code injection ·
- CVE-2026-60004, Gitea: code injection ·
- CVE-2026-72530, TrueConf Server: code injection ·
- CVE-2025-62593, Ray-Project Ray: code injection ·
Added the same day
- CVE-2025-42599, Qualitia Active! Mail: stack-based buffer overflow ·
- CVE-2025-1976, Broadcom Brocade Fabric OS: code injection ·
References
- ^ Cybersecurity and Infrastructure Security Agency. “Commvault Web Server Unspecified Vulnerability”. Known Exploited Vulnerabilities Catalog, added 28 Apr 2025.
- ^ National Institute of Standards and Technology. “CVE-2025-3928 Detail”. National Vulnerability Database, published 25 Apr 2025.
- ^ Commvault. Advisories and fixes: documentation.commvault.com, commvault.com, commvault.com, commvault.com.
- ^ FIRST. “Exploit Prediction Scoring System”. EPSS 0.025, percentile 84.9, 31 Oct 2026.
- CVE Program. “CVE-2025-3928”. The official CVE record.
This article is built from CISA’s catalog (version 2026.10.30), NVD’s record and FIRST’s scores, kept in HARD’s database and checked every morning. The plain English is HARD’s.