How severe is CVE-2021-28173?

CVE-2021-28173 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-28173 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (75th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-28173?

CVE-2021-28173 affects Deltaflow Project Deltaflow. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-28173?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2021-28173 published?

CVE-2021-28173 was published on 2021-04-06 and last updated on 2026-06-17.

CVE-2021-28173

CVE-2021-28173 is a critical-severity vulnerability in Deltaflow Project Deltaflow with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-434.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 2% (75th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-434
Affected product: Deltaflow Project Deltaflow
Published: 2021-04-06
Last modified: 2026-06-17

Description

The file upload function of Vangene deltaFlow E-platform does not perform access controlled properly. Remote attackers can upload and execute arbitrary files without login.

Frequently asked questions

What is CVE-2021-28173?: The file upload function of Vangene deltaFlow E-platform does not perform access controlled properly. Remote attackers can upload and execute arbitrary files without login.
How severe is CVE-2021-28173?: CVE-2021-28173 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-28173 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (75th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-28173?: CVE-2021-28173 affects Deltaflow Project Deltaflow. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-28173?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-28173 published?: CVE-2021-28173 was published on 2021-04-06 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:deltaflow_project:deltaflow:*:*:*:*:*:*:*:*

More vulnerabilities in Deltaflow Project Deltaflow

CVE-2021-28171 — Critical (CVSS 9.8): The Vangene deltaFlow E-platform does not take properly protective measures. Attackers can obtain privileged…
CVE-2021-28172 — High (CVSS 7.5): There is a Path Traversal vulnerability in the file download function of Vangene deltaFlow E-platform. Remote attackers…

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Other CWE-434 (Unrestricted Upload of File with Dangerous Type) vulnerabilities

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