What is CVE-2018-12087?

CVE-2018-12087 is a medium-severity vulnerability in Opcfoundation Ua-.net-Legacy, classified under Improper Certificate Validation. CVSS score: 5.3/10. Published 2018-10-03.

How severe is CVE-2018-12087?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Opcfoundation Ua-.net-Legacy

CVE-2018-12087

Failure to validate certificates in OPC Foundation UA Client Applications communicating without security allows attackers with control over a piece of network infrastructure to decrypt passwords.

Vulnerability class: Improper Certificate Validation

Published 2018-10-03 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.0/AV:P/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.003 (19.1th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 19th percentile — 19.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-295 — Improper Certificate Validation

References

opcfoundation-onlineapplications.org/faq/SecurityBulletins/OPC_Foundation_Secur… (Mitigation, Vendor Advisory)

Frequently asked questions

What is CVE-2018-12087?: CVE-2018-12087 is a medium-severity vulnerability in Opcfoundation Ua-.net-Legacy, classified under Improper Certificate Validation. CVSS score: 5.3/10. Published 2018-10-03.
How severe is CVE-2018-12087?: Medium severity. CVSS v3 base score is 5.3 out of 10.