What is CVE-2021-34994?

CVE-2021-34994 is a high-severity vulnerability in Commvault Commcell, classified under Improper Input Validation. CVSS score: 8.8/10. Published 2022-01-13.

How severe is CVE-2021-34994?

High severity. CVSS v3 base score is 8.8 out of 10.

RCE in Commvault Commcell

CVE-2021-34994

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Commvault CommCell 11.22.22. Although authentication is required to exploit this vulnerability, the existing authentication mechanism can be bypassed. The specific flaw exists within the DataProvider class. The issue results from the lack of proper validation of a user-supplied string before executing it as JavaScript code. An attacker can leverage this vulnerability to escape the JavaScript sandbox and execute Java code in the context of NETWORK SERVICE. Was ZDI-CAN-13755.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2022-01-13 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.058 (92.9th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 93rd percentile — 92.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.058 · newest: 0.058 · change: 0.000

Affected products

Commvault Commcell — versions 11.22.22

Weakness classification (CWE)

References

www.zerodayinitiative.com/advisories/ZDI-21-1329/ (VDB Entry, Third Party Advisory)

Frequently asked questions

What is CVE-2021-34994?: CVE-2021-34994 is a high-severity vulnerability in Commvault Commcell, classified under Improper Input Validation. CVSS score: 8.8/10. Published 2022-01-13.
How severe is CVE-2021-34994?: High severity. CVSS v3 base score is 8.8 out of 10.