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Fencer Intel
medium 6.5

CVE-2020-15791 json

A vulnerability has been identified in SIMATIC S7-300 CPU family (incl.

published 6y ago modified 4mo ago also EUVD-2020-7774

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 53%
public exploits
0
none known

Summary

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.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-20-252-02 updated cvss 5.9

Siemens SIMATIC S7-300 and S7-400 CPUs (Update C)

  • Siemens SIMATIC S7-300 CPU family (incl. related ET200 CPUs and SIPLUS variants) Siemens SIMATIC S7-400 CPU family (incl. SIPLUS variants) Siemens SIMATIC WinAC RTX (F) 2010 Siemens SINUMERIK 840D sl
    affected: vendor fix siemens.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
5mo ago

Exploit prediction

0.71% chance of exploitation in the next 30 days, higher than 53% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CISA ADP 3.1 6.5 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD 3.1 6.5 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CNA 3.1 6.5 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 3.3 AV:A/AC:L/Au:N/C:P/I:N/A:N

Affected products

  • Siemens SIMATIC S7-300 CPU family (incl. related ET200 CPUs and SIPLUS variants)
  • Siemens SIMATIC S7-400 CPU family (incl. SIPLUS variants)
  • Siemens SIMATIC WinAC RTX (F) 2010
  • Siemens SINUMERIK 840D sl

Classification

Weakness
  • CWE-522 Insufficiently Protected Credentials

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.