What is CVE-2020-28390?

CVE-2020-28390 is a medium-severity vulnerability in Siemens Opcenter Execution Core, classified under Insufficiently Protected Credentials. CVSS score: 5.5/10. Published 2021-01-12.

How severe is CVE-2020-28390?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Vulnerability in Siemens Opcenter Execution Core

CVE-2020-28390

A vulnerability has been identified in Opcenter Execution Core (V8.2), Opcenter Execution Core (V8.3). The application contains an information leakage vulnerability in the handling of web client sessions. A local attacker who has access to the Web Client Session Storage could disclose the passwords of currently logged-in users.

Published 2021-01-12 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.004 (35.9th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 36th percentile — 35.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Siemens Opcenter Execution Core — versions V8.2, V8.3
Siemens Opcenter Execution Core — versions 8.2, 8.3

Weakness classification (CWE)

CWE-522 — Insufficiently Protected Credentials

References

cert-portal.siemens.com/productcert/pdf/ssa-604937.pdf (Vendor Advisory)
www.zerodayinitiative.com/advisories/ZDI-21-051/ (Not Applicable)

Frequently asked questions

What is CVE-2020-28390?: CVE-2020-28390 is a medium-severity vulnerability in Siemens Opcenter Execution Core, classified under Insufficiently Protected Credentials. CVSS score: 5.5/10. Published 2021-01-12.
How severe is CVE-2020-28390?: Medium severity. CVSS v3 base score is 5.5 out of 10.