CVE-2021-4406Public exploitNetwork attack vector

Authenticated root command execution via webhook token injection

Published Jul 10, 2023 · Updated Sep 24, 2025

Command injection in OSNEXUS QuantaStor 6.0.0.355 and earlier allows remote authenticated users to execute commands as root. The Alert Manager's ITSM webhook service-token field is passed to a command without neutralizing shell metacharacters, so a crafted value is evaluated by the host shell. Administrative access to create and test alerts is required; successful exploitation grants full control of the storage appliance.

CVSS severity9.1
Critical
EPSS probability0.96%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Command injection in OSNEXUS QuantaStor 6.0.0.355 and earlier allows remote authenticated users to execute commands as root. The Alert Manager's ITSM webhook service-token field is passed to a command without neutralizing shell metacharacters, so a crafted value is evaluated by the host shell. Administrative access to create and test alerts is required; successful exploitation grants full control of the storage appliance.

The record

CVE
CVE-2021-4406
Published
Jul 10, 2023
Updated
Sep 24, 2025
Vendor
OSNEXUS
Product
QuantaStor
Classifications
CWE-77, T1059.004
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Jul 10, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 24, 2025Record 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=0 <=6.0.0.355

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

OSNEXUS · QuantaStorversion=0 <=6.0.0.355

Published CVSS scores

9.1DIVDCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
T1059.004Unix Shell

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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