A vulnerability has been identified in SCALANCE X-200RNA switch family (All versions < V3.2.7), SCALANCE X-300 switch family (incl.

published 2021-01-12 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-20854

cvss: 5.9; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.2%; EPSS 1.2% chance of exploitation in 30 days, percentile 68%
public exploits: 0; none known

A vulnerability has been identified in SCALANCE X-200RNA switch family (All versions < V3.2.7), SCALANCE X-300 switch family (incl. X408 and SIPLUS NET variants) (All versions < V4.1.0). Devices do not create a new unique private key after factory reset. An attacker could leverage this situation to a man-in-the-middle situation and decrypt previously captured traffic.

Patch / fix

fixed in 8

siemens scalance_xr324-12m_firmware 4.1.0
siemens scalance_xr324-12m_ts_firmware 4.1.0
siemens scalance_xr324-4m_eec_firmware 4.1.0
siemens scalance_xr324-4m_poe_firmware 4.1.0
siemens scalance_xr324-4m_poe_ts_firmware 4.1.0
siemens scalance_xr324wg_firmware 4.1.0
siemens scalance_xr326-2c_poe_wg_firmware 4.1.0
siemens scalance_xr328-4c_wg_firmware 4.1.0

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-200RNA switch family <V3.2.7
affected: fixed in V3.2.7, mitigation support.industry.siemens.com
Siemens SCALANCE X-300 switch family (incl. X408 and SIPLUS NET variants) <V4.1.0
affected: fixed in V4.1.0, 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

1.19% chance of exploitation in the next 30 days, higher than 68% 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-200RNA switch family
Siemens SCALANCE X-300 switch family (incl. X408 and SIPLUS NET variants)

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-2020-28395
NVD CVE-2020-28395

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