CVE-2020-28391

MEDIUM

SCALANCE X-200 and X-200IRT Firmware < 5.5.0 - Use of Hard-coded Cryptographic Key via C-PLUG

Title source: llm
STIX 2.1

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.

References (2)

Core 2
Core References
Third Party Advisory, US Government Resource, Vendor Advisory
https://us-cert.cisa.gov/ics/advisories/icsa-21-012-02

Scores

CVSS v3 5.9
EPSS 0.0016
EPSS Percentile 36.5%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Details

CWE
CWE-321 CWE-798
Status published
Products (50)
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_x307-3_firmware
siemens/scalance_x307-3ld_firmware
siemens/scalance_x308-2_firmware
siemens/scalance_x308-2ld_firmware
... and 40 more
Published Jan 12, 2021
Tracked Since Feb 18, 2026