CVE-2021-4406
Authenticated Remote COmmand Execution as root in OSNEXUS QuantaStor version 6.0.0.355 and others
An authenticated attacker is able to create alerts that trigger a stored XSS attack.
POC
-
go to the alert manager
-
open the ITSM tab
-
add a webhook with the URL/service token value
' -h && id | tee /tmp/ttttttddddssss #' (whitespaces are tab characters)
-
click add
-
click apply
-
create a test alert
-
The test alert will run the command
“id | tee /tmp/ttttttddddssss” as root.
- after the test alert inspect
/tmp/ttttttddddssss it'll contain the ids of the root user.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- High
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Authenticated Remote COmmand Execution as root in OSNEXUS QuantaStor version 6.0.0.355 and others
An authenticated attacker is able to create alerts that trigger a stored XSS attack.
POC
-
go to the alert manager
-
open the ITSM tab
-
add a webhook with the URL/service token value
' -h && id | tee /tmp/ttttttddddssss #' (whitespaces are tab characters)
-
click add
-
click apply
-
create a test alert
-
The test alert will run the command
“id | tee /tmp/ttttttddddssss” as root.
- after the test alert inspect
/tmp/ttttttddddssss it'll contain the ids of the root user.
- Record
CVE-2021-4406- CVSS 3.1
- 9.1 Critical
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H - Weakness
- CWE-77
- Updated
- 2026-11-02
EUVDEUVD-2021-34233
An authenticated attacker is able to create alerts that trigger a stored XSS attack.
POC
-
go to the alert manager
-
open the ITSM tab
-
add a webhook with the URL/service token value
' -h && id | tee /tmp/ttttttddddssss #' (whitespaces are tab characters)
-
click add
-
click apply
-
create a test alert
-
The test alert will run the command
“id | tee /tmp/ttttttddddssss” as root.
- after the test alert inspect
/tmp/ttttttddddssss it'll contain the ids of the root user.
- Record
EUVD-2021-34233- CVSS 3.1
- 9.1 Critical
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-2xf9-j9jw-g7f7
An administrator is able to execute commands as root via the alerts management dialog
An administrator is able to execute commands as root via the alerts management dialog
- Record
GHSA-2xf9-j9jw-g7f7- CVSS 3.1
- 9.1 Critical
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H - Weakness
- CWE-77
- Updated
- 2026-11-02
NVD
An authenticated attacker is able to create alerts that trigger a stored XSS attack.
POC
-
go to the alert manager
-
open the ITSM tab
-
add a webhook with the URL/service token value
' -h && id | tee /tmp/ttttttddddssss #' (whitespaces are tab characters)
-
click add
-
click apply
-
create a test alert
-
The test alert will run the command
“id | tee /tmp/ttttttddddssss” as root.
- after the test alert inspect
/tmp/ttttttddddssss it'll contain the ids of the root user.
- Record
CVE-2021-4406- CVSS 3.1
- 9.1 Critical
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H - CVSS 3.1
- 7.2 High
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-77
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-4406 is a critical vulnerability (CVSS 9.1) in Osnexus Quantastor, published July 10, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.96%, the 61st percentile. No source names a fixed version.