CVE-2021-28171Network attack vector

Remote privilege escalation via tampered authentication cookie

Published Apr 6, 2021 · Updated Sep 16, 2024

Broken authentication in Vangene deltaFlow E-platform version 4 allows remote attackers to obtain privileged permissions by tampering with Cookie data. The platform fails to apply protective measures to authentication data stored in the Cookie, allowing crafted values to be accepted as elevated authorization. The attack is unauthenticated and network reachable; successful tampering grants privileged access with impacts to confidentiality, integrity, and availability.

CVSS severity9.8
Critical
EPSS probability1.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Broken authentication in Vangene deltaFlow E-platform version 4 allows remote attackers to obtain privileged permissions by tampering with Cookie data. The platform fails to apply protective measures to authentication data stored in the Cookie, allowing crafted values to be accepted as elevated authorization. The attack is unauthenticated and network reachable; successful tampering grants privileged access with impacts to confidentiality, integrity, and availability.

The record

CVE
CVE-2021-28171
Published
Apr 6, 2021
Updated
Sep 16, 2024
Vendor
Vangene
Product
deltaFlow E-platform
Classifications
CWE-522, T1606.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 6, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Vangene · deltaFlow E-platformversion=4

Published CVSS scores

9.8TWCERT/CCCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-522Insufficiently Protected Credentials
T1606.001Web Cookies

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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