CVE-2020-28397

Name: CVE-2020-28397
Creator: NVD / NIST
Published: 2021-08-10T11:15:07.423+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 0.75%

Last modified Jun 17, 2026

CVE-2020-28397 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. 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. EPSS estimates a 0.75% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5.3/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS Probability

0.75%

50.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Siemens	Cpu 1504d Tf Firmware	< 2.9.2
Siemens	Cpu 1507d Tf Firmware	< 2.9.2
Siemens	Cpu 1515sp Pc2 Tf Firmware	< 21.9
Siemens	Simatic S7 Plcsim Advanced Firmware	>= 2.0, < 4.0
Siemens	Simatic S7-1500 Software Controller	>= 2.5, < 21.9
Siemens	Tim 1531 Irc Firmware	2.1
Siemens	Cpu 1211c Firmware	4.4
Siemens	Cpu 1212c Firmware	4.4
Siemens	Cpu 1212fc Firmware	4.4
Siemens	Cpu 1214fc Firmware	4.4
Siemens	Cpu 1214c Firmware	4.4
Siemens	Cpu 1215fc Firmware	4.4
Siemens	Cpu 1215c Firmware	4.4
Siemens	Cpu 1217c Firmware	4.4
Siemens	Siplus Cpu 1510sp F-1pn Firmware	>= 2.5, < 2.9.2
Siemens	Siplus Cpu 1511-1 Pn Firmware	>= 2.5, < 2.9.2
Siemens	Siplus Cpu 1511f-1 Pn Firmware	>= 2.5, < 2.9.2
Siemens	Siplus Cpu 1512sp-1 Pn Firmware	>= 2.5, < 2.9.2
Siemens	Siplus Cpu 1512sp F-1pn Firmware	>= 2.5, < 2.9.2
Siemens	Siplus Cpu 1513-1 Pn Firmware	>= 2.5, < 2.9.2
Siemens	Siplus Cpu 1513f-1 Pn Firmware	>= 2.5, < 2.9.2
Siemens	Siplus Cpu 1516-3 Pn\/Dp Firmware	>= 2.5, < 2.9.2
Siemens	Siplus Cpu-1516f-3 Pn\/Dp Firmware	>= 2.5, < 2.9.2
Siemens	Siplus Cpu 1518-4 Pn\/Dp Firmware	>= 2.5, < 2.9.2
Siemens	Siplus Cpu 1518f-4 Pn\/Dp Firmware	>= 2.5, < 2.9.2
Siemens	Cpu 1510sp-1pn Firmware	>= 2.5, < 2.9.2
Siemens	Cpu1510sp F-1 Firmware	>= 2.5, < 2.9.2
Siemens	Cpu 1511-1pn Firmware	>= 2.5, < 2.9.2
Siemens	Cpu 1511c-1 Pn Firmware	>= 2.5, < 2.9.2
Siemens	Cpu 1511f-1pn Firmware	>= 2.5, < 2.9.2
Siemens	Cpu 1511t-1pn Firmware	>= 2.5, < 2.9.2
Siemens	Cpu 1511tf-1pn Firmware	>= 2.5, < 2.9.2
Siemens	Cpu 1512c-1 Pn Firmware	>= 2.5, < 2.9.2
Siemens	Cpu 1512sp-1 Pn Firmware	>= 2.5, < 2.9.2
Siemens	Cpu 1512sp F-1 Pn Firmware	>= 2.5, < 2.9.2
Siemens	Cpu 1513-1 Pn Firmware	>= 2.5, < 2.9.2
Siemens	Cpu 1513f-1 Pn Firmware	>= 2.5, < 2.9.2
Siemens	Cpu 1513r-1 Pn Firmware	>= 2.5, < 2.9.2
Siemens	Cpu 1513pro F-2 Pn Firmware	>= 2.5, < 2.9.2
Siemens	Cpu 1515-2 Firmware	>= 2.5, < 2.9.2
Siemens	Cpu 1515f-2 Firmware	>= 2.5, < 2.9.2
Siemens	Cpu 1515r-2 Pn Firmware	>= 2.5, < 2.9.2
Siemens	Cpu 1515t-2 Pn Firmware	>= 2.5, < 2.9.2
Siemens	Cpu 1515tf-2 Pn Firmware	>= 2.5, < 2.9.2
Siemens	Cpu 1516pro F-2 Pn Firmware	>= 2.5, < 2.9.2
Siemens	Cpu 1516pro-2 Pn Firmware	>= 2.5, < 2.9.2
Siemens	Cpu 1516-3 Firmware	>= 2.5, < 2.9.2
Siemens	Cpu 1516f-3 Firmware	>= 2.5, < 2.9.2.
Siemens	Cpu 1516t-3 Pn\/Dp Firmware	>= 2.5, < 2.9.2
Siemens	Cpu 1516tf-3 Pn\/Dp Firmware	>= 2.5, < 2.9.2

Showing 50 of 56 affected configurations. See NVD for the full list.

References

https://cert-portal.siemens.com/productcert/pdf/ssa-865327.pdfPatch, Vendor Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-865327.pdfPatch, Vendor Advisory

Timeline

Published: Aug 10, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-28397?

How severe is CVE-2020-28397?

CVE-2020-28397 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 0.75% probability of exploitation in the next 30 days.

How do I fix CVE-2020-28397?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-28397?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST