CVE-2020-28391: siemens scalance x-200 switch family (incl. siplus net variants) Use of Hard-coded Cryptographic Key
Vulnerability summary
CVE-2020-28391 is a medium (CVSS 5.9) Use of Hard-coded Cryptographic Key vulnerability in siemens scalance x-200 switch family (incl. siplus net variants). EPSS estimates a 1.13% chance of exploitation in the next 30 days, higher than 65.9% of scored vulnerabilities.
Timeline
- 12-01-2021PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
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 metrics
2 scores · 1 source · 2 versionsEPSS trend
Probability
1.13%
Chance of exploitation in the next 30 days
Percentile
66%
Versus all other CVEs
30-day change
+0.01 pp
From 1.12% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Siemens57 products
- 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 familyAll versions < V3.2.7
- scalance_x200-4pirt_firmware< 5.5.0
- scalance_x201-3pirt_firmware< 5.5.0
1 vendor · 57 products
References
2 links- cert-portal.siemens.com/productcert/pdf/ssa-274900.pdfVendor Advisory
us-cert.cisa.gov/ics/advisories/icsa-21-012-02Third Party AdvisoryUS Government ResourceVendor Advisory