CVE-2017-6027: An Arbitrary File Upload issue was discovered in 3S-Smart Software Solutions GmbH CODESYS Web Server

Q: How do I fix CVE-2017-6027?

web server: upgrade to newer than 2.3. Exact commands for each OS are on this page.

Q: Is CVE-2017-6027 being exploited?

CVE-2017-6027 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2017-6027 affect?

CVE-2017-6027 affects web server. Severity is critical (CVSS 9.8). An Arbitrary File Upload issue was discovered in 3S-Smart Software Solutions GmbH CODESYS Web Server. The following versions of CODESYS Web Server, part of the CODESYS WebVisu web browser visualization software, are affected: CODESYS Web Se

Q: How urgent is CVE-2017-6027?

Priority 61/100. Critical severity; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2017-6027 is a critical-severity flaw (CVSS 9.8) affecting web server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An Arbitrary File Upload issue was discovered in 3S-Smart Software Solutions GmbH CODESYS Web Server. The following versions of CODESYS Web Server, part of the CODESYS WebVisu web browser visualization software, are affected: CODESYS Web Server Versions 2.3 and prior. A specially crafted web server request may allow the upload of arbitrary files (with a dangerous type) to the CODESYS Web Server without authorization which may allow remote code ex

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	2.6% (top 14%)
CISA exploited list	No
Weakness	CWE-434
Published	2017-05-19
Last modified	2026-06-17

Publisher (CNA): ICS-CERT · Vendor: codesys

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

Am I affected?

Timeline

2017-05-19 03:29 UTCPublished CVE record published
2026-06-17 01:21 UTCUpdated Record last modified

codesys web server UPGRADE

Affected: <= 2.3

Fixed in: newer than 2.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy web-server || rpm -q web-server || web-server --version

2. UPGRADE to newer than 2.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade web-server

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade web-server

Note

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

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-2017-6027?

web server: upgrade to newer than 2.3. Exact commands for each OS are on this page.

Is CVE-2017-6027 being exploited?

CVE-2017-6027 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-2017-6027 affect?

CVE-2017-6027 affects web server. Severity is critical (CVSS 9.8). An Arbitrary File Upload issue was discovered in 3S-Smart Software Solutions GmbH CODESYS Web Server. The following versions of CODESYS Web Server, part of the CODESYS WebVisu web browser visualization software, are affected: CODESYS Web Se

How urgent is CVE-2017-6027?

Priority 61/100. Critical severity; Remotely exploitable, no login, no user action

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References

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