CVE-2020-15783

highpriority · track · 31EPSS 0.017 · 77 %ileDEEUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

1.67% (77th) EPSS

CVSS 7.8 · high

Is it mine?

24 products

Check your exposure

Who says so?

5 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 TDC CPU555 (All versions), SINUMERIK 840D sl (All versions). Sending multiple specially crafted packets to the affected devices could cause a Denial-of-Service on port 102. A cold restart is required to recover the service.

remediations

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

No vendor fix yet; a mitigation is available.

MitigationSIMATIC S7-300 CPU family (incl. related ET200 CPUs and SIPLUS variants)siemens_psirt
Protect network access to port 102/tcp of affected devices.
MitigationSIMATIC TDC CPU555siemens_psirt
Protect network access to port 102/tcp of affected devices.
MitigationSINUMERIK 840D slsiemens_psirt
Protect network access to port 102/tcp of affected devices.
MitigationSIMATIC S7-300 CPU family (incl. related ET200 CPUs and SIPLUS variants)cisa_csaf_ot
Protect network access to port 102/tcp of affected devices.
MitigationSIMATIC TDC CPU555cisa_csaf_ot
Protect network access to port 102/tcp of affected devices.
MitigationSINUMERIK 840D slcisa_csaf_ot
Protect network access to port 102/tcp of affected devices.
No fix plannedSIMATIC S7-300 CPU family (incl. related ET200 CPUs and SIPLUS variants)siemens_psirt
Currently no fix is planned
No fix plannedSIMATIC TDC CPU555siemens_psirt
Currently no fix is planned
No fix plannedSINUMERIK 840D slsiemens_psirt
Currently no fix is planned
No fix plannedSIMATIC S7-300 CPU family (incl. related ET200 CPUs and SIPLUS variants)cisa_csaf_ot
Currently no fix is planned
No fix plannedSIMATIC TDC CPU555cisa_csaf_ot
Currently no fix is planned
No fix plannedSINUMERIK 840D slcisa_csaf_ot
Currently no fix is planned

cvss

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

7.8

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5.9–7.8

v2.07.8highAV:N/AC:L/Au:N/C:N/I:N/A:Cprimary · NVD / NIST USexploitability 10 · impact 6.9

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 3.6

v3.15.9mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:U/RC:Csecondary · CISA US

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · ENISA EU

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondaryexploitability 3.9 · impact 3.6

v3.15.9mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:U/RC:Csecondary · Siemens ProductCERT DE

v3.16.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)

ssvc

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

Exploitation: none · Automatable: yes · Technical Impact: partialcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-400USCWE-400USCWE-400US

affected products (24)

Products and version ranges known to be affected.

SIMATIC S7-300 CPU family (incl. related ET200 CPUs and SIPLUS variants)all versionscisa_csaf_otUS
SIMATIC TDC CPU555all versionscisa_csaf_otUS
SINUMERIK 840D slall versionscisa_csaf_otUS
Siemens SIMATIC S7-300 CPU family (incl. related ET200 CPUs and SIPLUS variants)≤ vers:all/*cisa_csaf_otUS
Siemens SIMATIC TDC CPU555≤ vers:all/*cisa_csaf_otUS
Siemens SINUMERIK 840D sl≤ vers:all/*cisa_csaf_otUS
Siemens SIMATIC S7-300 CPU family (incl. related ET200 CPUs and SIPLUS variants)≤ All versionsenisa_euvdEU
Siemens SIMATIC TDC CPU555≤ 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:*:*:*:*:*:*:*:*
siemens simatic s7-300 cpu 317f-2 dp firmwareall versionsnvdUScpe:2.3:o:siemens:simatic_s7-300_cpu_317f-2_dp_firmware:*:*:*:*:*:*:*:*
siemens simatic s7-300 cpu 317f-2 pn firmwareall versionsnvdUScpe:2.3:o:siemens:simatic_s7-300_cpu_317f-2_pn_firmware:*:*:*:*:*:*:*:*
siemens simatic tdc cpu555 firmwareall versionsnvdUScpe:2.3:o:siemens:simatic_tdc_cpu555_firmware:*:*:*:*:*:*:*:*

showing 20 of 24

advisories (2)

Vendor and ecosystem advisories describing this.

SSA-492828SSA-492828: Denial-of-Service Vulnerability in SIMATIC S7-300 CPUs and SINUMERIK Controller2020-11-10csaf · siemens_psirtDE
A vulnerability in S7-300 might allow an attacker to cause a Denial- of-Service condition on port 102 of the affected devices by sending specially crafted packets. Siemens recommends specific countermeasures for products where updates are not, or not yet available.
ICSA-20-315-04Siemens SIMATIC S7-300 CPUs and SINUMERIK Controller (Update A)2020-11-10icsa · cisa_csaf_otUS
A vulnerability in S7-300 might allow an attacker to cause a Denial- of-Service condition on port 102 of the affected devices by sending specially crafted packets. Siemens recommends specific countermeasures for products where updates are not, or not yet available.

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 siemens_psirt NVD CVE.org MITRE

published 2020-11-12modified 2026-06-17

references (8)

External citations — patches, advisories, analysis.

scry

Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.

Free scan