CVE-2021-42083Public exploitNetwork attack vector

Root command execution via unescaped ITSM webhook fields

Published Jul 10, 2023 · Updated Sep 22, 2025

Command injection in OSNEXUS QuantaStor before 6.0.0.355 allows remote authenticated users to execute commands as root via an ITSM webhook. The alert manager passes a webhook URL or service-token value into a command context without neutralizing shell syntax, so a test alert evaluates injected commands. Access to create and apply an ITSM webhook and trigger a test alert is required; successful exploitation grants root-level command execution.

CVSS severity8.7
High
EPSS probability0.55%
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 before 6.0.0.355 allows remote authenticated users to execute commands as root via an ITSM webhook. The alert manager passes a webhook URL or service-token value into a command context without neutralizing shell syntax, so a test alert evaluates injected commands. Access to create and apply an ITSM webhook and trigger a test alert is required; successful exploitation grants root-level command execution.

The record

CVE
CVE-2021-42083
Published
Jul 10, 2023
Updated
Sep 22, 2025
Vendor
OSNEXUS
Product
QuantaStor
Classifications
CWE-79, T1059.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 10, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 22, 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 privilegesauthenticated

What is affected?

OSNEXUS · QuantaStorversion=0 <6.0.0.355

Published CVSS scores

8.7Dutch Institute for Vulnerability DisclosureCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
5.4NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

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

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.004Command and Scripting Interpreter Unix 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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