Which products and versions are affected by CVE-2021-34995?

Affected: CommCell (Commvault) versions 11.22.22, >= 11.22.22. The full list is in the CVE brief.

Is CVE-2021-34995 being exploited in the wild?

It is not listed in any known-exploited vulnerabilities catalog.

Is CVE-2021-34995 in the CISA KEV catalog?

No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.

Is there a public exploit for CVE-2021-34995?

No public exploit code is known.

Is there a fix for CVE-2021-34995?

No fixed version is listed yet; check the vendor advisory for mitigations.

How urgently should CVE-2021-34995 be patched?

Brandefense priority: patch immediately, because it is very likely to be exploited soon.

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Vulnerability Intelligence

CVE-2021-34995

High

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Commvault CommCell 11.22.22.

Published Jan 13, 2022 · Updated Nov 21, 2024

Key Facts

Patch immediately

CVE-2021-34995 is a high-severity vulnerability (CVSS 8.8 v3.1) affecting CommCell (Commvault).
It is not listed in any known-exploited vulnerabilities catalog. No public exploit code is known.
EPSS estimates a 69% probability of exploitation in the next 30 days.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.

CVSS v3.1

8.8

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS (30-day exploit likelihood)

69%

Higher than 99.3% of all scored CVEs

Exploited in the wild

No known

Not in a known-exploited catalog

Public exploit code

None known

Get the full CVE-2021-34995 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

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 DownloadCenterUploadHandler class. The issue results from the lack of proper validation of user-supplied data, which can allow the upload of arbitrary files. An attacker can leverage this vulnerability to execute code in the context of NETWORK SERVICE. Was ZDI-CAN-13756.

Affected Products

2 affected entries in total

Product	Affected versions	Fixed in
CommCellCommvault	11.22.22, >= 11.22.22	n/a

Timeline

Publicly disclosed
Jan 13, 2022
Last updated
Nov 21, 2024

Weakness Type

CWE-434 Unrestricted Upload of File with Dangerous Type

References

advisoryhttps://www.zerodayinitiative.com/advisories/ZDI-21-1330/

FAQ

Common Questions.

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Commvault CommCell 11.22.22.
Affected: CommCell (Commvault) versions 11.22.22, >= 11.22.22. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.

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