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DeltaflowApplication · Deltaflow Project

CVE-2021-28171

CRITICAL · 9.8 CVSS v3.1 Published 2021-04-06
Fix available
A fix is available. Upgrade to 7.7 or later.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable No privileges Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
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.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · moderate confidence

The Vangene deltaFlow E-platform contains an authentication/authorization vulnerability where user privilege levels are determined by client-side cookie values without proper server-side validation. Attackers can modify cookie data to impersonate privileged users and gain administrative access to the platform.

MitigationImplement server-side session validation with cryptographically signed cookies, enforce role-based access controls with server-side verification, and invalidate any client-supplied privilege data.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
DeltaflowApplication
Affected:>= 4.0, < 7.7

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify installed deltaFlow version
    Access the application's about page, help menu, or check the footer for the version number. Alternatively, check HTTP response headers or the application's configuration files for the version string.
    Affected if The version is greater than or equal to 4.0 and less than 7.7
  2. Access the web login page
    Navigate to the deltaFlow E-platform login URL in a web browser and examine the login page structure.
    Affected if The application is reachable and displays a login interface where user authentication occurs
  3. Inspect authentication cookies after login
    Log in with a standard user account, then use browser developer tools (Application tab > Cookies) or a proxy tool to examine all cookies set by the application. Look for cookies containing terms like 'role', 'privilege', 'level', 'admin', 'userType', or similar privilege-related identifiers.
    Affected if Cookies contain unencrypted or plaintext values that directly encode user roles, privilege levels, or administrative status
  4. Verify cookie-based privilege assignment
    After authentication, modify a cookie value that appears to control privileges (such as changing a role from 'user' to 'admin' or increasing a numeric privilege level) and observe whether the application grants elevated access without re-authentication.
    Affected if Modifying cookie values alters the user's apparent privilege level without server-side validation triggering an access denial

You are affected if the installed deltaFlow version is between 4.0 and 7.7 (inclusive) and the application uses client-side cookies to store or determine user privilege levels without verified server-side session validation.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 7.7 or later
Fixed in 7.7
Interim mitigation

Implement server-side session validation with cryptographically signed cookies, enforce role-based access controls with server-side verification, and invalidate any client-supplied privilege data.

Recommended fix Moderate confidence

DeltaFlow 7.7 or later

  1. Upgrade DeltaFlow to version 7.7 or later to remediate the insufficient credential protection vulnerability
  2. After upgrading, verify that cookie-based authentication properly protects credentials
  3. Confirm that cookie tampering no longer allows privilege escalation

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Deltaflow Scoped from the published advisory
  • Consultation6.0 h
  • Implementation12.0 h
  • Testing6.0 h
  • Review / QA4.0 h
28.0 hours of engineering $4,980
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $7,968.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2021-28171 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data