CVE-2021-34997Network attack vector

Authenticated code execution via unrestricted App Studio upload

Published Jan 13, 2022 · Updated Aug 4, 2024

Arbitrary file upload in Commvault CommCell 11.22.22 allows remote authenticated users to execute code as NETWORK SERVICE. AppStudioUploadHandler fails to validate user-supplied upload data and accepts an arbitrary file that the server can execute. Non-administrator CommCell access is sufficient, and successful exploitation runs attacker-controlled code with NETWORK SERVICE privileges.

CVSS severity8.8
High
EPSS probability4.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Arbitrary file upload in Commvault CommCell 11.22.22 allows remote authenticated users to execute code as NETWORK SERVICE. AppStudioUploadHandler fails to validate user-supplied upload data and accepts an arbitrary file that the server can execute. Non-administrator CommCell access is sufficient, and successful exploitation runs attacker-controlled code with NETWORK SERVICE privileges.

The record

CVE
CVE-2021-34997
Published
Jan 13, 2022
Updated
Aug 4, 2024
Vendor
Commvault
Product
CommCell
Classifications
CWE-434, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 13, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=11.22.22

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Commvault · CommCellversion=11.22.22

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.8Zero Day InitiativeCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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