CVE-2020-28397

mediumpriority · track · 21OT risk · elevatedEPSS 0.008 · 55 %ileDEEUUS
grimoire priorityP3 · Track
Exploitable?
—
no known exploitation
Likely / severe?
0.75% (55th) EPSS
CVSS 5 · medium
Is it mine?
84 products
Check your exposure
Who says so?
4 sources
cnnvd · enisa_euvd · cisa_csaf_ot · siemens_psirt

EPSS · scored 2026-10-26

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.

01

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

02

cvss

Technical severity, 0–10. One row per scoring source.

5.3
010

base score 0–10 · higher = more severe · hover a vector to decode

v2.05mediumAV:N/AC:L/Au:N/C:P/I:N/A:Nprimary · NVD / NIST USexploitability 10 · impact 2.9
v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:Nprimary · NVD / NIST USexploitability 3.9 · impact 1.4
v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:P/RL:O/RC:Csecondary · CISA US
v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:P/RL:O/RC:Csecondary · Siemens ProductCERT DE
v3.14.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:Usecondary · CVSS-BT (t0sche)
03

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-863USprimaryCWE-863USCWE-863US
04

affected products (84)

Products and version ranges known to be affected.

showing 20 of 84
05

advisories (2)

Vendor and ecosystem advisories describing this.

  • SSA-865327SSA-865327: Incorrect Authorization Vulnerability in Industrial Products2021-08-10csaf · siemens_psirtDE

    The latest updates for the below mentioned products fix a vulnerability that allows an unauthenticated attacker to read PLC variables from affected devices without proper authentication under certain circumstances. Siemens has released updates for some of the affected products, is working on updates for the remaining affected products and recommends specific countermeasures until fixes are available.

  • ICSA-21-257-23Siemens SIMATIC and TIM2021-08-10icsa · cisa_csaf_otUS

    The latest updates for the below mentioned products fix a vulnerability that allows an unauthenticated attacker to read PLC variables from affected devices without proper authentication under certain circumstances. Siemens has released updates for some of the affected products, is working on updates for the remaining affected products and recommends specific countermeasures until fixes are available.

06

also known as (3)

Other names and identifiers for this entity.

07

sources

Which sources assert this record, and when.

cnnvdenisa_euvdcisa_csaf_otsiemens_psirtNVDCVE.orgMITRE
published 2021-08-10modified 2026-06-17
09

references (6)

External citations — patches, advisories, analysis.

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