Plaintext Storage of a password in CODESYS V3 OPC DA Server

published 2022-07-11 4 y ago modified 2026-06-17 4 mo ago also EUVD-2022-25074

cvss: 5.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 11%
public exploits: 0; none known

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.

Patch / fix

fixed in 1

codesys opc_da_server 3.5.18.20

Exploit prediction

0.21% chance of exploitation in the next 30 days, higher than 11% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	5.5	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
NVD	2.0	4.7	AV:L/AC:M/Au:N/C:C/I:N/A:N

Affected products

CODESYS CODESYS OPC DA Server

Classification

Weakness

CWE-256 Plaintext Storage of a Password
CWE-522 Insufficiently Protected Credentials

References

customers.codesys.com /index.php?eID=dumpFile&t=f&f=17129&token=1c1485c4a700c04f2069699f5be7558d276ca117&download=
vendor-advisory

Sources

CVE List CVE-2022-1794
NVD CVE-2022-1794

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary