VULNERABILITY INTELLIGENCE

CVE-2020-28391

CVSS score5.9 MEDIUM

EPSS probability1.13%

CISA KEVNot currently listed

Published2021-01-12

Last modified2026-06-17

CVSS vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Description

A vulnerability has been identified in SCALANCE X-200 switch family (incl. SIPLUS NET variants) (All versions < V5.2.5), SCALANCE X-200IRT switch family (incl. SIPLUS NET variants) (All versions < V5.5.0), SCALANCE X-200RNA switch family (All versions < V3.2.7). Devices create a new unique key upon factory reset, except when used with C-PLUG. When used with C-PLUG the devices use the hardcoded private RSA-key shipped with the firmware-image. An attacker could leverage this situation to a man-in-the-middle situation and decrypt previously captured traffic.

Weakness classification

productcert@siemens.com: CWE-321
nvd@nist.gov: CWE-798

Primary references

productcert@siemens.com — Vendor Advisory
productcert@siemens.com — Third Party Advisory, US Government Resource, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108 — Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108 — Third Party Advisory, US Government Resource, Vendor Advisory