How severe is CVE-2021-34994?

CVE-2021-34994 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-34994 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 6% (92nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-34994?

CVE-2021-34994 affects Commvault Commcell. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-34994?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-34994 published?

CVE-2021-34994 was published on 2022-01-13 and last updated on 2026-06-17.

CVE-2021-34994

CVE-2021-34994 is a high-severity vulnerability in Commvault Commcell with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-94.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 6.5
EPSS exploit prediction: 6% (92nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-94
Affected product: Commvault Commcell
Published: 2022-01-13
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2021-34994?: CVE-2021-34994 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-34994 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 6% (92nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-34994?: CVE-2021-34994 affects Commvault Commcell. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-34994?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-34994 published?: CVE-2021-34994 was published on 2022-01-13 and last updated on 2026-06-17.

References

https://www.zerodayinitiative.com/advisories/ZDI-21-1329/

Affected products (1)

cpe:2.3:a:commvault:commcell:11.22.22:*:*:*:*:*:*:*

More vulnerabilities in Commvault Commcell

CVE-2021-34993 — Critical (CVSS 9.8): This vulnerability allows remote attackers to bypass authentication on affected installations of Commvault CommCell…
CVE-2021-34997 — High (CVSS 8.8): This vulnerability allows remote attackers to execute arbitrary code on affected installations of Commvault CommCell…
CVE-2021-34996 — High (CVSS 8.8): This vulnerability allows remote attackers to execute arbitrary code on affected installations of Commvault CommCell…
CVE-2021-34995 — High (CVSS 8.8): This vulnerability allows remote attackers to execute arbitrary code on affected installations of Commvault CommCell…
CVE-2020-25780 — High (CVSS 7.5): In CommCell in Commvault before 14.68, 15.x before 15.58, 16.x before 16.44, 17.x before 17.29, and 18.x before 18.13,…

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