CVE-2021-30193

Name: CVE-2021-30193
Creator: NVD / NIST
Published: 2021-05-25T13:15:17.88+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.15%

Last modified Jun 17, 2026

CVE-2021-30193 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. CODESYS V2 Web-Server before 1.1.9.20 has an Out-of-bounds Write.. EPSS estimates a 1.15% chance of exploitation in the next 30 days.

Description

CODESYS V2 Web-Server before 1.1.9.20 has an Out-of-bounds Write.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

1.15%

62.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-787

Affected Software

Vendor	Product	Versions
Wago	750-893 Firmware	< fw08
Wago	750-891 Firmware	< fw08
Wago	750-890 Firmware	< fw08
Wago	750-889 Firmware	< fw15
Wago	750-885 Firmware	< fw15
Wago	750-882 Firmware	< fw15
Wago	750-881 Firmware	< fw15
Wago	750-880 Firmware	< fw16
Wago	750-862 Firmware	< fw08
Wago	750-852 Firmware	< fw15
Wago	750-832 Firmware	< fw08
Wago	750-831 Firmware	< fw15
Wago	750-829 Firmware	< fw15
Wago	750-8202 Firmware	< 03.06.19_\(18\)
Wago	750-8203 Firmware	< 03.06.19_\(18\)
Wago	750-8204 Firmware	< 03.06.19_\(18\)
Wago	750-8206 Firmware	< 03.06.19_\(18\)
Wago	750-8207 Firmware	< 03.06.19_\(18\)
Wago	750-8208 Firmware	< 03.06.19_\(18\)
Wago	750-8210 Firmware	< 03.06.19_\(18\)
Wago	750-8211 Firmware	< 03.06.19_\(18\)
Wago	750-8212 Firmware	< 03.06.19_\(18\)
Wago	750-8213 Firmware	< 03.06.19_\(18\)
Wago	750-8214 Firmware	< 03.06.19_\(18\)
Wago	750-8216 Firmware	< 03.06.19_\(18\)
Wago	750-8217 Firmware	< 03.06.19_\(18\)
Codesys	V2 Web Server	< 1.1.9.20
Wago	750-823 Firmware	< fw08

References

https://customers.codesys.com/index.phpPermissions Required, Vendor Advisory
https://customers.codesys.com/index.php?eID=dumpFile&t=f&f=14726&token=553da5d11234bbe1ceed59969d419a71bb8c8747&download=Vendor Advisory
https://customers.codesys.com/index.phpPermissions Required, Vendor Advisory
https://customers.codesys.com/index.php?eID=dumpFile&t=f&f=14726&token=553da5d11234bbe1ceed59969d419a71bb8c8747&download=Vendor Advisory

Timeline

Published: May 25, 2021
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2021-30193?

CODESYS V2 Web-Server before 1.1.9.20 has an Out-of-bounds Write.

How severe is CVE-2021-30193?

CVE-2021-30193 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.15% probability of exploitation in the next 30 days.

How do I fix CVE-2021-30193?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-30193?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST