CVE-2022-1794: Plaintext Storage of a password in CODESYS V3 OPC DA Server

Severity: medium (CVSS 4.7 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-07-11 · updated 2026-06-17
Weakness: CWE-256

Description

The CODESYS OPC DA Server prior V3.5.18.20 stores PLC passwords as plain text in its configuration file so that it is visible to all authorized Microsoft Windows users of the system.

Affected products

CODESYS OPC DA Server: from 3.0.0 before 3.5.18.20 — fixed in 3.5.18.20

How to fix

Upgrade to a fixed version: CODESYS OPC DA Server 3.5.18.20. Check the vendor advisory for mitigations.

References

https://customers.codesys.com/index.php?eID=dumpFile&t=f&f=17129&token=1c1485c4a700c04f2069699f5be7558d276ca117&download=
https://customers.codesys.com/index.php?eID=dumpFile&t=f&f=17129&token=1c1485c4a700c04f2069699f5be7558d276ca117&download=

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