Threat Intelligence / CVE / CVE-2020-15791

CVE-2020-15791 — Siemens Simatic S7-300 Cpu 312 Firmware

CVSS v3.1 6.5 (MEDIUM) · EPSS 0.0% (higher than 24.0% of all scored CVEs) · Priority 4.2/10 · Published 2020-09-09

As of 2024-11-21, CVE-2020-15791 is a MEDIUM-severity vulnerability in Siemens Simatic S7-300 Cpu 312 Firmware, CVSS v3.1 6.5, EPSS 0.0% (24.0th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2020-15791, most recently “AI-Powered Attacks Targeting Siemens S7 Series PLCs in U.S. Critical Infrastructure”.

Last updated: 2024-11-21

What is CVE-2020-15791?

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.

The record classifies CVE-2020-15791 under weakness class CWE-522. Its CVSS v3 base vector states that the flaw is reachable from an adjacent network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality. 28 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 2195 days ago.

Severity and exploitation probability

CVSS v3.1 base score
6.5 — MEDIUM
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
EPSS (FIRST)
0.0% probability of exploitation in the next 30 days, higher than 24.0% of all scored CVEs
CISA KEV
Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority
4.2/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published
2020-09-09, last modified 2024-11-21

Is CVE-2020-15791 being exploited?

It currently carries a trending score of 11 in the Threadlinqs vulnerability feed.

Affected products and versions

Showing 25 of 28 recorded product entries.

How to fix CVE-2020-15791

The record marks a vendor fix as available for CVE-2020-15791. Patch reference: https://cert-portal.siemens.com/productcert/pdf/ssa-381684.pdf. Vendor advisory: https://cert-portal.siemens.com/productcert/pdf/ssa-381684.pdf. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.

Threat activity tracking CVE-2020-15791

1 tracked threat in the Threadlinqs corpus references CVE-2020-15791, either in the campaign’s CVE list or as an indicator on the campaign record.

Sources

Seeded from nvd and not yet processed by the Threadlinqs enrichment pipeline, so blank CVSS, EPSS or KEV fields above mean NOT MEASURED rather than measured-absent.

Full detection coverage & IOCs for threats exploiting CVE-2020-15791 are available via the Threadlinqs MCP server (Purple tier). View plans →

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