How severe is CVE-2021-34996?

CVE-2021-34996 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-2021-34996 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 82% (100th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-34996?

CVE-2021-34996 affects Commvault Commcell. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-34996?

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-2021-34996 published?

CVE-2021-34996 was published on 2022-01-13 and last updated on 2026-06-17.

CVE-2021-34996

CVE-2021-34996 is a high-severity vulnerability in Commvault Commcell with a CVSS 3.x base score of 8.8. Its EPSS exploit-prediction score of 82% places it in the 100th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-749.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 9.0
EPSS exploit prediction: 82% (100th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-749
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 Demo_ExecuteProcessOnGroup workflow. By creating a workflow, an attacker can specify an arbitrary command to be executed. An attacker can leverage this vulnerability to execute code in the context of SYSTEM. Was ZDI-CAN-13889.

Frequently asked questions

What is CVE-2021-34996?: 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 Demo_ExecuteProcessOnGroup workflow. By creating a workflow, an attacker can specify an arbitrary command to be executed. An attacker can leverage this vulnerability to execute code in the context of SYSTEM. Was ZDI-CAN-13889.
How severe is CVE-2021-34996?: CVE-2021-34996 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-2021-34996 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 82% (100th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-34996?: CVE-2021-34996 affects Commvault Commcell. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-34996?: 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-2021-34996 published?: CVE-2021-34996 was published on 2022-01-13 and last updated on 2026-06-17.

References

https://www.zerodayinitiative.com/advisories/ZDI-21-1331/

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-2021-34995 — High (CVSS 8.8): This vulnerability allows remote attackers to execute arbitrary code on affected installations of Commvault CommCell…
CVE-2021-34994 — 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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