CVE-2020-12069 — In CODESYS V3 products in all versions prior V3

In CODESYS V3 products in all versions prior V3.5.16.0 containing the CmpUserMgr, the CODESYS Control runtime system stores the online communication passwords using a weak hashing algorithm. This can be used by a local attacker with low privileges to gain full control of the devi

01What is this vulnerability?

In CODESYS V3 products in all versions prior V3.5.16.0 containing the CmpUserMgr, the CODESYS Control runtime system stores the online communication passwords using a weak hashing algorithm. This can be used by a local attacker with low privileges to gain full control of the device.

02Affected products

Vendor	Product	Versions
CODESYS	CODESYS V3 containing the CmpUserMgr	V3

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2022-12-26T00:00:00.000Z
• Last modified: 2025-04-14T16:17:54.368Z

09References

• customers.codesys.com — https://customers.codesys.com/index.php?eID=dumpFile&t=f&f=12943&token=d097958a6…
• cert.vde.com — https://cert.vde.com/en/advisories/VDE-2021-061/
• cert.vde.com — https://cert.vde.com/en/advisories/VDE-2022-031/
• cert.vde.com — https://cert.vde.com/en/advisories/VDE-2022-022/