CVE-2021-28173: The file upload function of Vangene deltaFlow E-platform does not perform access controlled properly

This month

CRITICAL 9.8REMOTEUPGRADE

CVE-2021-28173 is a critical-severity flaw (CVSS 9.8) affecting deltaflow. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.6% (top 24%)
CISA exploited list	No
Weakness	CWE-434
Published	2021-04-06
Last modified	2026-06-17

Publisher (CNA): TWCERT/CC · Vendor: deltaflow project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-04-06 12:15 UTCPublished CVE record published
2026-06-17 03:45 UTCUpdated Record last modified

deltaflow project deltaflow UPGRADE

Affected: >= 4.0 and < 7.7

Fixed in: 7.7

Safe to downgrade to: a release before 4.0

1. Check installed version

apt-cache policy deltaflow || rpm -q deltaflow || deltaflow --version

2. UPGRADE to 7.7 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade deltaflow

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade deltaflow

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 4.0 (Debian / Ubuntu)

apt-cache madison deltaflow sudo apt install deltaflow=<VERSION_BEFORE_4.0> sudo apt-mark hold deltaflow

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list deltaflow sudo dnf downgrade deltaflow-<VERSION_BEFORE_4.0> sudo dnf versionlock add deltaflow

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-28173?

deltaflow: upgrade to 7.7. Exact commands for each OS are on this page.

Is CVE-2021-28173 being exploited?

CVE-2021-28173 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-28173 affect?

CVE-2021-28173 affects deltaflow. Severity is critical (CVSS 9.8). 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 urgent is CVE-2021-28173?

Priority 58/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2021-28172 HIGH 7.5 UPGRADE There is a Path Traversal vulnerability in the file download function of Vangene deltaFlow E-platform
CVE-2021-28171 CRITICAL 9.8 UPGRADE The Vangene deltaFlow E-platform does not take properly protective measures

References

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