How severe is CVE-2017-6027?

CVE-2017-6027 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2017-6027 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-6027?

CVE-2017-6027 affects Codesys Web Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2017-6027?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2017-6027 published?

CVE-2017-6027 was published on 2017-05-19 and last updated on 2026-06-17.

CVE-2017-6027

CVE-2017-6027 is a critical-severity vulnerability in Codesys Web Server with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-434.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 3% (84th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-434
Affected product: Codesys Web Server
Published: 2017-05-19
Last modified: 2026-06-17

Description

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 execution.

Frequently asked questions

What is CVE-2017-6027?: 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 execution.
How severe is CVE-2017-6027?: CVE-2017-6027 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2017-6027 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-6027?: CVE-2017-6027 affects Codesys Web Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2017-6027?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2017-6027 published?: CVE-2017-6027 was published on 2017-05-19 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:codesys:web_server:*:*:*:*:*:*:*:*

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