What is CVE-2021-28171?

CVE-2021-28171 is a critical-severity vulnerability in Deltaflow Project, classified under Insufficiently Protected Credentials. CVSS score: 9.8/10. Published 2021-04-06.

How severe is CVE-2021-28171?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Deltaflow Project

CVE-2021-28171

The Vangene deltaFlow E-platform does not take properly protective measures. Attackers can obtain privileged permissions remotely by tampering with users’ data in the Cookie.

Published 2021-04-06 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.012 (66.5th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 67th percentile — 66.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000

Affected products

Deltaflow Project
Vangene Deltaflow E-Platform — versions 4

Weakness classification (CWE)

References

www.twcert.org.tw/tw/cp-132-4618-4dcc2-1.html (Third Party Advisory)
www.chtsecurity.com/news/7f0874b5-516b-4637-842d-b6fb6c335c66 (Third Party Advisory)

Frequently asked questions

What is CVE-2021-28171?: CVE-2021-28171 is a critical-severity vulnerability in Deltaflow Project, classified under Insufficiently Protected Credentials. CVSS score: 9.8/10. Published 2021-04-06.
How severe is CVE-2021-28171?: Critical severity. CVSS v3 base score is 9.8 out of 10.