A vulnerability has been identified in SCALANCE X-200 switch family (incl.

published 2021-01-12 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-20850

cvss: 5.9; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.1%; EPSS 1.1% chance of exploitation in 30 days, percentile 66%
public exploits: 0; none known

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.

Patch / fix

fixed in 20

siemens scalance_x200-4pirt_firmware 5.5.0
siemens scalance_x201-3pirt_firmware 5.5.0
siemens scalance_x202-2irt_firmware 5.5.0
siemens scalance_x202-2pirt_firmware 5.5.0
siemens scalance_x202-2pirt_siplus_net_firmware 5.5.0
siemens scalance_x204irt_firmware 5.5.0
siemens scalance_xb205-3_firmware 5.2.5
siemens scalance_xb205-3ld_firmware 5.2.5
siemens scalance_xb208_firmware 5.2.5
siemens scalance_xb213-3_firmware 5.2.5
siemens scalance_xb213-3ld_firmware 5.2.5
siemens scalance_xb216_firmware 5.2.5
siemens scalance_xc206-2_firmware 5.2.5
siemens scalance_xc206-2g_poe__firmware 5.2.5
siemens scalance_xc206-2g_poe_eec_firmware 5.2.5
siemens scalance_xc206-2sfp_firmware 5.2.5
siemens scalance_xc206-2sfp_eec_firmware 5.2.5
siemens scalance_xc206-2sfp_g_firmware 5.2.5
siemens scalance_xc206-2sfp_g_(e/ip)_firmware 5.2.5
siemens scalance_xc206-2sfp_g_eec_firmware 5.2.5

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-21-012-02 updated 2022-12-13 cvss 9.1

Siemens SCALANCE X Switches (Update B)

Siemens SCALANCE X-200 switch family (incl. SIPLUS NET variants) <V5.2.5
affected: fixed in V5.2.5, mitigation support.industry.siemens.com
Siemens SCALANCE X-200IRT switch family (incl. SIPLUS NET variants) <V5.5.0
affected: fixed in V5.5.0, mitigation support.industry.siemens.com
Siemens SCALANCE X-200RNA switch family <V3.2.7
affected: fixed in V3.2.7, mitigation support.industry.siemens.com

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

Exploit prediction

1.13% chance of exploitation in the next 30 days, higher than 66% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.1	5.9	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD	2.0	4.3	AV:N/AC:M/Au:N/C:P/I:N/A:N

Affected products

Siemens SCALANCE X-200 switch family (incl. SIPLUS NET variants)
Siemens SCALANCE X-200IRT switch family (incl. SIPLUS NET variants)
Siemens SCALANCE X-200RNA switch family

Classification

Weakness

CWE-321 Use of Hard-coded Cryptographic Key
CWE-798 Use of Hard-coded Credentials

References

cert-portal.siemens.com /productcert/pdf/ssa-274900.pdf
vendor-advisory
us-cert.cisa.gov /ics/advisories/icsa-21-012-02
third-party-advisory, us-government-resource, vendor-advisory

Sources

CVE List CVE-2020-28391
NVD CVE-2020-28391

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary