CVE-2020-28391

mediumpriority · track · 24OT risk · elevatedEPSS 0.011 · 66 %ileDEEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

1.13% (66th) EPSS

CVSS 4.3 · medium

Is it mine?

81 products

Check your exposure

Who says so?

6 sources

cnnvd · enisa_euvd · fstec_bdu · cisa_csaf_ot

EPSS · scored 2026-10-27

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.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

FixedSCALANCE X-200 switch family (incl. SIPLUS NET variants)siemens_psirt
Update to V5.2.5 or later version
https://support.industry.siemens.com/cs/ww/en/view/109801131/
FixedSCALANCE X-200IRT switch family (incl. SIPLUS NET variants)siemens_psirt
Update to V5.5.0 or later version
https://support.industry.siemens.com/cs/ww/en/view/109792534/
FixedSCALANCE X-200RNA switch familysiemens_psirt
Update to V3.2.7 or later version
https://support.industry.siemens.com/cs/ww/en/view/109814809/
FixedSCALANCE X-200 switch family (incl. SIPLUS NET variants)cisa_csaf_ot
Update to V5.2.5 or later version
https://support.industry.siemens.com/cs/ww/en/view/109801131/
FixedSCALANCE X-200IRT switch family (incl. SIPLUS NET variants)cisa_csaf_ot
Update to V5.5.0 or later version
https://support.industry.siemens.com/cs/ww/en/view/109792534/
FixedSCALANCE X-200RNA switch familycisa_csaf_ot
Update to V3.2.7 or later version
https://support.industry.siemens.com/cs/ww/en/view/109814809/
MitigationSCALANCE X-200 switch family (incl. SIPLUS NET variants)siemens_psirt
Update the default hardcoded X.509 certificates from the firmware image (fingerprints SHA-1: F2:C8:3B:8F:86:27:74:AA:60:EC:D4:A0:CF:0D:BE:A6:D1:FE:22:12 and SHA-256: 25:60:DB:B3: F9:07:9D:69:0E:DD:A9:EB:4E:1C:D5:8E:AF:79:16:C3:C8:13:A6:F6:59:AD:05:E4:6F:77:F7:72 - fingerprints for X-200RNA switch devices SHA-1: 04:64:EF:98:A4:42:D2:BB:57:4A:47:12:20:EC:E6:85:15:4F:03:61 and SHA-256: 9C:15:FA:56:ED:FF:CA:8D:17:16:E9:2C:57:CB:90:3C:4E:81:5B:3D:60:E9:CF:26:07:B3:73:F6:C7:02:75:88)
MitigationSCALANCE X-200IRT switch family (incl. SIPLUS NET variants)siemens_psirt
Update the default hardcoded X.509 certificates from the firmware image (fingerprints SHA-1: F2:C8:3B:8F:86:27:74:AA:60:EC:D4:A0:CF:0D:BE:A6:D1:FE:22:12 and SHA-256: 25:60:DB:B3: F9:07:9D:69:0E:DD:A9:EB:4E:1C:D5:8E:AF:79:16:C3:C8:13:A6:F6:59:AD:05:E4:6F:77:F7:72 - fingerprints for X-200RNA switch devices SHA-1: 04:64:EF:98:A4:42:D2:BB:57:4A:47:12:20:EC:E6:85:15:4F:03:61 and SHA-256: 9C:15:FA:56:ED:FF:CA:8D:17:16:E9:2C:57:CB:90:3C:4E:81:5B:3D:60:E9:CF:26:07:B3:73:F6:C7:02:75:88)
MitigationSCALANCE X-200RNA switch familysiemens_psirt
Update the default hardcoded X.509 certificates from the firmware image (fingerprints SHA-1: F2:C8:3B:8F:86:27:74:AA:60:EC:D4:A0:CF:0D:BE:A6:D1:FE:22:12 and SHA-256: 25:60:DB:B3: F9:07:9D:69:0E:DD:A9:EB:4E:1C:D5:8E:AF:79:16:C3:C8:13:A6:F6:59:AD:05:E4:6F:77:F7:72 - fingerprints for X-200RNA switch devices SHA-1: 04:64:EF:98:A4:42:D2:BB:57:4A:47:12:20:EC:E6:85:15:4F:03:61 and SHA-256: 9C:15:FA:56:ED:FF:CA:8D:17:16:E9:2C:57:CB:90:3C:4E:81:5B:3D:60:E9:CF:26:07:B3:73:F6:C7:02:75:88)
MitigationSCALANCE X-200 switch family (incl. SIPLUS NET variants)cisa_csaf_ot
Update the default hardcoded X.509 certificates from the firmware image (fingerprints SHA-1: F2:C8:3B:8F:86:27:74:AA:60:EC:D4:A0:CF:0D:BE:A6:D1:FE:22:12 and SHA-256: 25:60:DB:B3: F9:07:9D:69:0E:DD:A9:EB:4E:1C:D5:8E:AF:79:16:C3:C8:13:A6:F6:59:AD:05:E4:6F:77:F7:72 - fingerprints for X-200RNA switch devices SHA-1: 04:64:EF:98:A4:42:D2:BB:57:4A:47:12:20:EC:E6:85:15:4F:03:61 and SHA-256: 9C:15:FA:56:ED:FF:CA:8D:17:16:E9:2C:57:CB:90:3C:4E:81:5B:3D:60:E9:CF:26:07:B3:73:F6:C7:02:75:88)
MitigationSCALANCE X-200IRT switch family (incl. SIPLUS NET variants)cisa_csaf_ot
Update the default hardcoded X.509 certificates from the firmware image (fingerprints SHA-1: F2:C8:3B:8F:86:27:74:AA:60:EC:D4:A0:CF:0D:BE:A6:D1:FE:22:12 and SHA-256: 25:60:DB:B3: F9:07:9D:69:0E:DD:A9:EB:4E:1C:D5:8E:AF:79:16:C3:C8:13:A6:F6:59:AD:05:E4:6F:77:F7:72 - fingerprints for X-200RNA switch devices SHA-1: 04:64:EF:98:A4:42:D2:BB:57:4A:47:12:20:EC:E6:85:15:4F:03:61 and SHA-256: 9C:15:FA:56:ED:FF:CA:8D:17:16:E9:2C:57:CB:90:3C:4E:81:5B:3D:60:E9:CF:26:07:B3:73:F6:C7:02:75:88)
MitigationSCALANCE X-200RNA switch familycisa_csaf_ot
Update the default hardcoded X.509 certificates from the firmware image (fingerprints SHA-1: F2:C8:3B:8F:86:27:74:AA:60:EC:D4:A0:CF:0D:BE:A6:D1:FE:22:12 and SHA-256: 25:60:DB:B3: F9:07:9D:69:0E:DD:A9:EB:4E:1C:D5:8E:AF:79:16:C3:C8:13:A6:F6:59:AD:05:E4:6F:77:F7:72 - fingerprints for X-200RNA switch devices SHA-1: 04:64:EF:98:A4:42:D2:BB:57:4A:47:12:20:EC:E6:85:15:4F:03:61 and SHA-256: 9C:15:FA:56:ED:FF:CA:8D:17:16:E9:2C:57:CB:90:3C:4E:81:5B:3D:60:E9:CF:26:07:B3:73:F6:C7:02:75:88)

cvss

Technical severity, 0–10. One row per scoring source.

9.1

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–critical · 4.3–9.1

v2.04.3mediumAV:N/AC:M/Au:N/C:P/I:N/A:Nprimary · NVD / NIST USexploitability 8.6 · impact 2.9

v3.15.9mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:Nprimary · NVD / NIST USexploitability 2.2 · impact 3.6

v3.19.1criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:P/RL:U/RC:Csecondary · CISA US

v3.19.1criticalAV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Nsecondary · FSTEC (BDU) RU

v3.19.1criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:P/RL:U/RC:Csecondary · Siemens ProductCERT DE

v3.15.4mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-321USCWE-321USCWE-321USCWE-321USCWE-798US

affected products (81)

Products and version ranges known to be affected.

SCALANCE X-200 switch family (incl. SIPLUS NET variants)all versionscisa_csaf_otUS
SCALANCE X-200IRT switch family (incl. SIPLUS NET variants)all versionscisa_csaf_otUS
SCALANCE X-200RNA switch familyall versionscisa_csaf_otUS
Siemens SCALANCE X-200 switch family (incl. SIPLUS NET variants)< V5.2.5cisa_csaf_otUS
Siemens SCALANCE X-200IRT switch family (incl. SIPLUS NET variants)< V5.5.0cisa_csaf_otUS
Siemens SCALANCE X-200RNA switch family< V3.2.7cisa_csaf_otUS
Siemens SCALANCE X-200 switch family (incl. SIPLUS NET variants)All versions → V5.2.5enisa_euvdEU
Siemens SCALANCE X-200IRT switch family (incl. SIPLUS NET variants)All versions → V5.5.0enisa_euvdEU
Siemens SCALANCE X-200RNA switch familyAll versions → V3.2.7enisa_euvdEU
Siemens AG SCALANCE X-200all versionsfstec_bduRU
Siemens AG SCALANCE X-200 IRT≤ 5.5.0fstec_bduRU
Siemens AG SCALANCE X-300≤ 4.1.0fstec_bduRU
siemens scalance x200-4pirt firmware< 5.5.0nvdUScpe:2.3:o:siemens:scalance_x200-4pirt_firmware:*:*:*:*:*:*:*:*
siemens scalance x201-3pirt firmware< 5.5.0nvdUScpe:2.3:o:siemens:scalance_x201-3pirt_firmware:*:*:*:*:*:*:*:*
siemens scalance x202-2irt firmware< 5.5.0nvdUScpe:2.3:o:siemens:scalance_x202-2irt_firmware:*:*:*:*:*:*:*:*
siemens scalance x202-2pirt firmware< 5.5.0nvdUScpe:2.3:o:siemens:scalance_x202-2pirt_firmware:*:*:*:*:*:*:*:*
siemens scalance x202-2pirt siplus net firmware< 5.5.0nvdUScpe:2.3:o:siemens:scalance_x202-2pirt_siplus_net_firmware:*:*:*:*:*:*:*:*
siemens scalance x204irt firmware< 5.5.0nvdUScpe:2.3:o:siemens:scalance_x204irt_firmware:*:*:*:*:*:*:*:*
siemens scalance x307-3 firmwareall versionsnvdUScpe:2.3:o:siemens:scalance_x307-3_firmware:*:*:*:*:*:*:*:*
siemens scalance x307-3ld firmwareall versionsnvdUScpe:2.3:o:siemens:scalance_x307-3ld_firmware:*:*:*:*:*:*:*:*

showing 20 of 81

advisories (2)

Vendor and ecosystem advisories describing this.

SSA-274900SSA-274900: Use of Hardcoded Key in SCALANCE X Devices Under Certain Conditions2021-01-12csaf · siemens_psirtDE
SCALANCE X devices might not generate a unique random key after factory reset, and use a private key shipped with the firmware. Siemens has released updates for the affected products and recommends to update to the latest versions.
ICSA-21-012-02Siemens SCALANCE X Switches (Update B)2021-01-12icsa · cisa_csaf_otUS
SCALANCE X devices might not generate a unique random key after factory reset, and use a private key shipped with the firmware. Siemens has released updates for the affected products and recommends to update to the latest versions.

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cisa_csaf_ot nvd siemens_psirt NVD CVE.org MITRE

published 2021-01-12modified 2026-06-17

references (8)

External citations — patches, advisories, analysis.

scry

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