CVE-2020-28397

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-08-10 · updated 2026-06-17
Weakness: CWE-863

Description

A vulnerability has been identified in SIMATIC Drive Controller family (All versions < V2.9.2), SIMATIC ET 200SP Open Controller CPU 1515SP PC2 (incl. SIPLUS variants) (All versions < V21.9), SIMATIC S7 PLCSIM Advanced (All versions > V2 < V4), SIMATIC S7-1200 CPU family (incl. SIPLUS variants) (Version V4.4), SIMATIC S7-1500 CPU family (incl. related ET200 CPUs and SIPLUS variants) (All versions > V2.5 < V2.9.2), SIMATIC S7-1500 Software Controller (All versions > V2.5 < V21.9), TIM 1531 IRC (incl. SIPLUS NET variants) (Version V2.1). Due to an incorrect authorization check in the affected component, an attacker could extract information about access protected PLC program variables over port 102/tcp from an affected device when reading multiple attributes at once.

Affected products

Siemens Cpu1510Sp F-1 Firmware: from 2.5 before 2.9.2 — fixed in 2.9.2
Siemens Cpu 1211C Firmware: 4.4
Siemens Cpu 1212C Firmware: 4.4
Siemens Cpu 1212Fc Firmware: 4.4
Siemens Cpu 1214C Firmware: 4.4
Siemens Cpu 1214Fc Firmware: 4.4
Siemens Cpu 1215C Firmware: 4.4
Siemens Cpu 1215Fc Firmware: 4.4
Siemens Cpu 1217C Firmware: 4.4
Siemens Cpu 1504D Tf Firmware: before 2.9.2 — fixed in 2.9.2
Siemens Cpu 1507D Tf Firmware: before 2.9.2 — fixed in 2.9.2
Siemens Cpu 1510Sp-1Pn Firmware: from 2.5 before 2.9.2 — fixed in 2.9.2
Siemens Cpu 1511-1Pn Firmware: from 2.5 before 2.9.2 — fixed in 2.9.2
Siemens Cpu 1511C-1 Pn Firmware: from 2.5 before 2.9.2 — fixed in 2.9.2
Siemens Cpu 1511F-1Pn Firmware: from 2.5 before 2.9.2 — fixed in 2.9.2
Siemens Cpu 1511T-1Pn Firmware: from 2.5 before 2.9.2 — fixed in 2.9.2
Siemens Cpu 1511Tf-1Pn Firmware: from 2.5 before 2.9.2 — fixed in 2.9.2
Siemens Cpu 1512C-1 Pn Firmware: from 2.5 before 2.9.2 — fixed in 2.9.2
Siemens Cpu 1512Sp-1 Pn Firmware: from 2.5 before 2.9.2 — fixed in 2.9.2
Siemens Cpu 1512Sp F-1 Pn Firmware: from 2.5 before 2.9.2 — fixed in 2.9.2
Siemens Cpu 1513-1 Pn Firmware: from 2.5 before 2.9.2 — fixed in 2.9.2
Siemens Cpu 1513F-1 Pn Firmware: from 2.5 before 2.9.2 — fixed in 2.9.2
Siemens Cpu 1513Pro F-2 Pn Firmware: from 2.5 before 2.9.2 — fixed in 2.9.2
Siemens Cpu 1513R-1 Pn Firmware: from 2.5 before 2.9.2 — fixed in 2.9.2
Siemens Cpu 1515-2 Firmware: from 2.5 before 2.9.2 — fixed in 2.9.2
Siemens Cpu 1515F-2 Firmware: from 2.5 before 2.9.2 — fixed in 2.9.2
Siemens Cpu 1515R-2 Pn Firmware: from 2.5 before 2.9.2 — fixed in 2.9.2
Siemens Cpu 1515Sp Pc2 Tf Firmware: before 21.9 — fixed in 21.9
Siemens Cpu 1515T-2 Pn Firmware: from 2.5 before 2.9.2 — fixed in 2.9.2
Siemens Cpu 1515Tf-2 Pn Firmware: from 2.5 before 2.9.2 — fixed in 2.9.2

How to fix

Upgrade to a fixed version: Siemens Cpu1510Sp F-1 Firmware 2.9.2; Siemens Cpu 1504D Tf Firmware 2.9.2; Siemens Cpu 1507D Tf Firmware 2.9.2; Siemens Cpu 1510Sp-1Pn Firmware 2.9.2; Siemens Cpu 1511-1Pn Firmware 2.9.2; Siemens Cpu 1511C-1 Pn Firmware 2.9.2; Siemens Cpu 1511F-1Pn Firmware 2.9.2; Siemens Cpu 1511T-1Pn Firmware 2.9.2; Siemens Cpu 1511Tf-1Pn Firmware 2.9.2; Siemens Cpu 1512C-1 Pn Firmware 2.9.2; Siemens Cpu 1512Sp-1 Pn Firmware 2.9.2; Siemens Cpu 1512Sp F-1 Pn Firmware 2.9.2. Check the vendor advisory for mitigations.

References

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