CVE-2021-4406

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.96% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 61.4% of scored records. A rank, not a probability.

NVD base score

7.2 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2023-07-10 06:29Z3 YR AGO

Last updated

2025-09-24 15:46Z1 YR AGO

Reserved

2023-07-05

Assigning CNA

DIVD

Record state

PUBLISHED

Severity

Critical (CVSS 9.1)

CNA CVSS vector

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

Weaknesses

• CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')Class

Data version

5.1

Document digest

6dea6b865f03871d4b48ab25774a5f327eeecdf6c51dbd06f0c5f14feff04704

• csirt.divd.nlhttps://csirt.divd.nl/DIVD-2021-00020/third-party-advisory
• www.osnexus.comhttps://www.osnexus.com/products/software-defined-storageproduct
• csirt.divd.nlhttps://csirt.divd.nl/CVE-2021-4406third-party-advisoryexploittechnical-description
• www.divd.nlhttps://www.divd.nl/DIVD-2021-00020third-party-advisory
• csirt.divd.nlhttps://csirt.divd.nl/cves/CVE-2021-4406/exploit