CVE-2020-28397

What it is

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.

At a glance

Exploitability

Can be exploited over the network without logging in. Limited direct impact.

Exploit odds

0.8% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2021-08-10 11:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 03:10 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 0.8% in the next 30 days (EPSS).
• Severity: 5.3 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2021-08-10 11:15 UTC

Last modified

2026-06-17 03:10 UTC

Exploit probability

0.8% · EPSS, next 30 days

Weakness

CWE-863 · Incorrect authorization

Record status

Modified

Affected

• 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 < 4.0
• Siemens Simatic s7-1500 Software Controller < 21.9
• Siemens Tim 1531 Irc Firmware 2.1
• Siemens Cpu 1211c Firmware 4.4
• Siemens Cpu 1212c Firmware 4.4

Attack profile CVSS 3.1 · 5.3

Attack vector

Network

Complexity

Low

Privileges needed

None

User interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

None

Is it in your code?

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