CVE-2020-15783
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).
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.67%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 1.67% probability · 77th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-400
- Affected
- siemens/sinumerik 840d sl firmware · siemens/simatic s7-300 cpu 312 firmware · siemens/simatic s7-300 cpu 314 firmware · siemens/simatic s7-300 cpu 315-2 dp firmware · siemens/simatic s7-300 cpu 315-2 pn firmware · siemens/simatic s7-300 cpu 317-2 pn firmware · siemens/simatic s7-300 cpu 317-2 dp firmware · siemens/simatic s7-300 cpu 315f-2 dp firmware · siemens/simatic s7-300 cpu 315f-2 pn firmware · siemens/simatic s7-300 cpu 317f-2 pn firmware · siemens/simatic s7-300 cpu 317f-2 dp firmware · siemens/simatic tdc cpu555 firmware
- Source
- productcert@siemens.com
EPSS 1.7% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://cert-portal.siemens.com/productcert/pdf/ssa-492828.pdfMitigation, Vendor Advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-492828.pdfMitigation, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.