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Vulnerability record · CVE-2020-28391 · published 12 January 2021

CVE-2020-28391: Siemens scalance x200-4pirt firmware hard-coded credentials vulnerability

Siemens · Scalance X200 4pirt Firmware

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.

5.9 CVSS 3.1 Medium EPSS 1.1% · top 35.2% CWE-321 · CWE-321CWE-798 · Hard-coded credentials
5.9CVSS 3.1 base score, v2 4.3
1.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
66Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

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.

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

Affected products

66 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://cert-portal.siemens.com/productcert/pdf/ssa-274900.pdf Vendor Advisory
https://us-cert.cisa.gov/ics/advisories/icsa-21-012-02 Third Party AdvisoryUS Government ResourceVendor Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-274900.pdf Vendor Advisory
https://us-cert.cisa.gov/ics/advisories/icsa-21-012-02 Third Party AdvisoryUS Government ResourceVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2020-15800Siemens scalance x200-4pirt firmware heap-based buffer overflow vulnerabilityA vulnerability has been identified in SCALANCE X-200 switch family (incl. SIPLUS NET variants) (All versions < V5.2.5), SCALANCE X-200IRT switch fam…EPSS 1.7%9.8CVE-2020-25226Siemens scalance x200-4pirt firmware heap-based buffer overflow vulnerabilityA vulnerability has been identified in SCALANCE X-200 switch family (incl. SIPLUS NET variants) (All versions < V5.2.5), SCALANCE X-200IRT switch fam…EPSS 1.7%9.6CVE-2022-26649Siemens scalance x204-2 firmware classic buffer overflow vulnerabilityA vulnerability has been identified in SCALANCE X200-4P IRT (All versions < V5.5.2), SCALANCE X201-3P IRT (All versions < V5.5.2), SCALANCE X201-3P I…EPSS 1.3%8.8CVE-2022-26647Siemens scalance x200-4p irt firmware vulnerabilityA vulnerability has been identified in SCALANCE X200-4P IRT (All versions < V5.5.2), SCALANCE X201-3P IRT (All versions < V5.5.2), SCALANCE X201-3P I…EPSS 1.1%8.2CVE-2022-26648Siemens scalance x204-2 firmware classic buffer overflow vulnerabilityA vulnerability has been identified in SCALANCE X200-4P IRT (All versions < V5.5.2), SCALANCE X201-3P IRT (All versions < V5.5.2), SCALANCE X201-3P I…EPSS 0.94%7.4CVE-2023-29054Siemens scalance x200-4p irt firmware inadequate encryption strength vulnerabilityA vulnerability has been identified in SCALANCE X200-4P IRT (All versions < V5.5.2), SCALANCE X201-3P IRT (All versions < V5.5.2), SCALANCE X201-3P I…EPSS 0.26%6.5CVE-2020-15799Siemens scalance x200-4pirt firmware missing authentication for critical function vulnerabilityA vulnerability has been identified in SCALANCE X-200 switch family (incl. SIPLUS NET variants) (All versions < V5.2.5), SCALANCE X-200IRT switch fam…EPSS 1.1%6.1CVE-2022-40631Siemens scalance x200-4p irt firmware cross-site scripting vulnerabilityA vulnerability has been identified in SCALANCE X200-4P IRT (All versions < V5.5.0), SCALANCE X201-3P IRT (All versions < V5.5.0), SCALANCE X201-3P I…EPSS 0.47%

Source: NIST National Vulnerability Database (record CVE-2020-28391), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.