How severe is CVE-2020-28391?

CVE-2020-28391 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2020-28391 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-28391?

CVE-2020-28391 primarily affects Siemens Scalance X200-4pirt Firmware. In total, 66 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-28391?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2020-28391 published?

CVE-2020-28391 was published on 2021-01-12 and last updated on 2026-06-17.

CVE-2020-28391

CVE-2020-28391 is a medium-severity vulnerability in Siemens Scalance X200-4pirt Firmware with a CVSS 3.x base score of 5.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-321.

Key facts

Severity: Medium (CVSS 3.x base score 5.9)
CVSS v2: 4.3
EPSS exploit prediction: 1% (62nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-321
Affected product: Siemens Scalance X200-4pirt Firmware
Published: 2021-01-12
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2020-28391?: 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.
How severe is CVE-2020-28391?: CVE-2020-28391 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2020-28391 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-28391?: CVE-2020-28391 primarily affects Siemens Scalance X200-4pirt Firmware. In total, 66 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-28391?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-28391 published?: CVE-2020-28391 was published on 2021-01-12 and last updated on 2026-06-17.

References

Affected products (66)

cpe:2.3:o:siemens:scalance_x200-4pirt_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_x201-3pirt_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_x202-2irt_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_x202-2pirt_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_x202-2pirt_siplus_net_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_x204irt_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_x307-3_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_x307-3ld_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_x308-2_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_x308-2ld_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_x308-2lh_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_x308-2lh\+_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_x308-2m_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_x308-2m_ts_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_x310_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_x310fe_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_x320-1fe_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_x320-3ldfe_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_xb205-3_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_xb205-3ld_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_xb208_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_xb213-3_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_xb213-3ld_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_xb216_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_xc206-2_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_xc206-2g_poe__firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_xc206-2g_poe_eec_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_xc206-2sfp_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_xc206-2sfp_eec_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_xc206-2sfp_g_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_xc206-2sfp_g_\(e\/ip\)_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_xc206-2sfp_g_eec_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_xc208_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_xc208eec_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_xc208g_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_xc208g_\(e\/ip\)_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_xc208g_eec_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_xc208g_poe_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_xc216_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_xc216-4c_firmware:*:*:*:*:*:*:*:*

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