CVE-2021-42081: An authenticated administrator is allowed to remotely execute arbitrary shell commands via the API. POC http:

Q: How do I fix CVE-2021-42081?

quantastor: upgrade to 6.0.0.355. Exact commands for each OS are on this page.

Q: Is CVE-2021-42081 being exploited?

CVE-2021-42081 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-42081 affect?

CVE-2021-42081 affects quantastor. Severity is critical (CVSS 9.1). An authenticated administrator is allowed to remotely execute arbitrary shell commands via the API. POC http:// /qstorapi/storageSystemModify?storageSystem=&newName=quantastor&newDescription=;ls${IFS}-al&newLocation=4&newEnclosu

This month

CRITICAL 9.1UPGRADE

CVE-2021-42081 is a critical-severity flaw (CVSS 9.1) affecting quantastor. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An authenticated administrator is allowed to remotely execute arbitrary shell commands via the API. POC http://<IP_ADDRESS>/qstorapi/storageSystemModify?storageSystem=&newName=quantastor&newDescription=;ls${IFS}-al&newLocation=4&newEnclosureLayoutId=5&newDnsServerList=;ls${IFS}-al&externalHostName=&newNTPServerList=;ls${IFS}-al

Why this priority

Critical severity

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	1.2% (top 31%)
CISA exploited list	No
Weakness	CWE-78
Published	2023-07-10
Last modified	2026-06-17

Publisher (CNA): Dutch Institute for Vulnerability Disclosure · Vendor: osnexus

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-07-10 16:15 UTCPublished CVE record published
2026-06-17 04:09 UTCUpdated Record last modified

osnexus quantastor UPGRADE

Affected: < 6.0.0.355

Fixed in: 6.0.0.355

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy quantastor || rpm -q quantastor || quantastor --version

2. UPGRADE to 6.0.0.355 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade quantastor

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade quantastor

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-42081?

quantastor: upgrade to 6.0.0.355. Exact commands for each OS are on this page.

Is CVE-2021-42081 being exploited?

CVE-2021-42081 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-42081 affect?

CVE-2021-42081 affects quantastor. Severity is critical (CVSS 9.1). An authenticated administrator is allowed to remotely execute arbitrary shell commands via the API. POC http://<IP_ADDRESS>/qstorapi/storageSystemModify?storageSystem=&newName=quantastor&newDescription=;ls${IFS}-al&newLocation=4&newEnclosu

How urgent is CVE-2021-42081?

Priority 49/100. Critical severity

Related CVEs

CVE-2021-4406 CRITICAL 9.1 UPGRADE An authenticated attacker is able to create alerts that trigger a stored XSS attack. POC * go to the ale
CVE-2021-42083 HIGH 8.7 UPGRADE An authenticated attacker is able to create alerts that trigger a stored XSS attack. POC * go to the ale
CVE-2021-42082 HIGH 7.8 UPGRADE Local users are able to execute scripts under root privileges. POC On the local host run the following comma
CVE-2021-42080 HIGH 7.4 UPGRADE An attacker is able to launch a Reflected XSS attack using a crafted URL. POC: Visit the following URL https
CVE-2021-42079 MEDIUM 6.2 UPGRADE An authenticated administrator is able to prepare an alert that is able to execute an SSRF attack

References

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