7.8

CVE-2020-15783: siemens simatic s7-300 cpu family (incl. related et200 cpus and siplus variants) Uncontrolled Resource Consumption

CVSS: 7.8v2.0HighModified
Published 12-11-2020Last modified 02-06-2026
Open JSON

Vulnerability summary

CVE-2020-15783 is a high (CVSS 7.8) Uncontrolled Resource Consumption vulnerability in siemens simatic s7-300 cpu family (incl. related et200 cpus and siplus variants). EPSS estimates a 1.67% chance of exploitation in the next 30 days, higher than 76.3% of scored vulnerabilities.

Overall risk
32/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.8/10
010
High · v2.0 (NVD)
EPSS score
1.67%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 12-11-2020
    PublishedVulnerability first disclosed.
  2. 02-06-2026
    Last modifiedVulnerability information updated.

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 metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

1.67%

Chance of exploitation in the next 30 days

Percentile

76%

Versus all other CVEs

30-day change

0.00 pp

From 1.67% on 18-09-2026

18-09-202618-10-2026
EPSS score
1.67%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Siemens3 products

1 vendor · 3 products

References

1 links