CVE-2020-15791

lowpriority · track · 26EPSS 0.007 · 54 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.72% (54th) EPSS

CVSS 3.3 · low

Is it mine?

26 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · cisa_csaf_ot · nvd

EPSS · scored 2026-10-26

A vulnerability has been identified in SIMATIC S7-300 CPU family (incl. related ET200 CPUs and SIPLUS variants) (All versions), SIMATIC S7-400 CPU family (incl. SIPLUS variants) (All versions), SIMATIC WinAC RTX (F) 2010 (All versions), SINUMERIK 840D sl (All versions). The authentication protocol between a client and a PLC via port 102/tcp (ISO-TSAP) insufficiently protects the transmitted password. This could allow an attacker that is able to intercept the network traffic to obtain valid PLC credentials.

remediations

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

A vendor fix is available.

FixedSIMATIC S7-300 CPU family (incl. related ET200 CPUs and SIPLUS variants)cisa_csaf_ot
For more information on this vulnerability and the associated mitigations, please see Siemens security advisory SSA-381684
https://new.siemens.com/global/en/products/services/cert.html#SecurityPublications
FixedSIMATIC S7-400 CPU family (incl. SIPLUS variants)cisa_csaf_ot
For more information on this vulnerability and the associated mitigations, please see Siemens security advisory SSA-381684
https://new.siemens.com/global/en/products/services/cert.html#SecurityPublications
FixedSIMATIC WinAC RTX (F) 2010cisa_csaf_ot
For more information on this vulnerability and the associated mitigations, please see Siemens security advisory SSA-381684
https://new.siemens.com/global/en/products/services/cert.html#SecurityPublications
FixedSINUMERIK 840D slcisa_csaf_ot
For more information on this vulnerability and the associated mitigations, please see Siemens security advisory SSA-381684
https://new.siemens.com/global/en/products/services/cert.html#SecurityPublications

cvss

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

6.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 3.3–6.5

v2.03.3lowAV:A/AC:L/Au:N/C:P/I:N/A:Nprimary · NVD / NIST USexploitability 6.5 · impact 2.9

v3.16.5mediumCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:Nprimary · NVD / NIST USexploitability 2.8 · impact 3.6

v3.05.9mediumCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N/E:P/RL:U/RC:Csecondary · CISA US

v3.16.5mediumCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:Nsecondary · ENISA EU

v3.16.5mediumCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:Nsecondaryexploitability 2.8 · impact 3.6

v3.16mediumCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-522USCWE-522US

affected products (26)

Products and version ranges known to be affected.

SIMATIC S7-300 CPU family (incl. related ET200 CPUs and SIPLUS variants): All versionsall versionscisa_csaf_otUS
SIMATIC S7-400 CPU family (incl. SIPLUS variants): All versionsall versionscisa_csaf_otUS
SIMATIC WinAC RTX (F) 2010: All versionsall versionscisa_csaf_otUS
SINUMERIK 840D sl: All versionsall versionscisa_csaf_otUS
Siemens SIMATIC S7-300 CPU family (incl. related ET200 CPUs and SIPLUS variants)all versionscisa_csaf_otUS
Siemens SIMATIC S7-400 CPU family (incl. SIPLUS variants)all versionscisa_csaf_otUS
Siemens SIMATIC WinAC RTX (F) 2010all versionscisa_csaf_otUS
Siemens SINUMERIK 840D slall versionscisa_csaf_otUS
Siemens SIMATIC S7-300 CPU family (incl. related ET200 CPUs and SIPLUS variants)≤ All versionsenisa_euvdEU
Siemens SIMATIC S7-400 CPU family (incl. SIPLUS variants)≤ All versionsenisa_euvdEU
Siemens SIMATIC WinAC RTX (F) 2010≤ All versionsenisa_euvdEU
Siemens SINUMERIK 840D sl≤ All versionsenisa_euvdEU
siemens simatic s7-300 cpu 312 firmwareall versionsnvdUScpe:2.3:o:siemens:simatic_s7-300_cpu_312_firmware:*:*:*:*:*:*:*:*
siemens simatic s7-300 cpu 314 firmwareall versionsnvdUScpe:2.3:o:siemens:simatic_s7-300_cpu_314_firmware:*:*:*:*:*:*:*:*
siemens simatic s7-300 cpu 315-2 dp firmwareall versionsnvdUScpe:2.3:o:siemens:simatic_s7-300_cpu_315-2_dp_firmware:*:*:*:*:*:*:*:*
siemens simatic s7-300 cpu 315-2 pn firmwareall versionsnvdUScpe:2.3:o:siemens:simatic_s7-300_cpu_315-2_pn_firmware:*:*:*:*:*:*:*:*
siemens simatic s7-300 cpu 315f-2 dp firmwareall versionsnvdUScpe:2.3:o:siemens:simatic_s7-300_cpu_315f-2_dp_firmware:*:*:*:*:*:*:*:*
siemens simatic s7-300 cpu 315f-2 pn firmwareall versionsnvdUScpe:2.3:o:siemens:simatic_s7-300_cpu_315f-2_pn_firmware:*:*:*:*:*:*:*:*
siemens simatic s7-300 cpu 317-2 dp firmwareall versionsnvdUScpe:2.3:o:siemens:simatic_s7-300_cpu_317-2_dp_firmware:*:*:*:*:*:*:*:*
siemens simatic s7-300 cpu 317-2 pn firmwareall versionsnvdUScpe:2.3:o:siemens:simatic_s7-300_cpu_317-2_pn_firmware:*:*:*:*:*:*:*:*

showing 20 of 26

advisories (1)

Vendor and ecosystem advisories describing this.

ICSA-20-252-02Siemens SIMATIC S7-300 and S7-400 CPUs (Update C)2020-09-08icsa · cisa_csaf_otUS
Successful exploitation of this vulnerability could result in credential disclosure.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd cisa_csaf_ot nvd NVD CVE.org MITRE

published 2020-09-09modified 2026-06-17

references (7)

External citations — patches, advisories, analysis.

scry

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