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CVE-2021-42081

22
FAUCET Score

CVE-2021-42081 is a critical vulnerability affecting OSNexus QuantaStor, allowing an authenticated administrator to execute arbitrary shell commands remotely via the API. With a CVSS score of 7.2 (HIGH), this flaw presents a significant risk, enabling full compromise of confidentiality, integrity, and availability if exploited. While no public exploits or active exploitation have been observed, and community discussion is minimal, the presence of a Proof-of-Concept (POC) demonstrates its exploitability.

Impacted Technologies

VendorProductVersion(s)CPE
< 6.0.0.355CPE matchmatch criteria
cpe:2.3:a:osnexus:quantastor:*:*:*:*:*:*:*:*
>= 0, < 6.0.0.355CPE match
cpe:2.3:a:osnexus:quantastor:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.1CRITICAL

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.3
Impact Score
6.0
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.23%
Probability of exploitation in next 30 days
EPSS Percentile
65.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0123 is in the 55th percentile among its peer group of 5,538 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.3 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

divd.nl / DIVD-2021-00020
csirt.divd.nl / CVE-2021-42081
Third Party Advisory
csirt.divd.nl / DIVD-2021-00020
osnexus.com / products/software-defined-storage
Product
wbsec.nl / osnexus
Third Party Advisory