7.5

CVE-2021-40365: siemens simatic drive controller cpu 1504d tf Improper Input Validation

CVSS: 7.5v3.1HighModified
Published 13-12-2022Last modified 21-04-2025
Open JSON

Vulnerability summary

CVE-2021-40365 is a high (CVSS 7.5) Improper Input Validation vulnerability in siemens simatic drive controller cpu 1504d tf. EPSS estimates a 0.93% chance of exploitation in the next 30 days, higher than 59.8% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.93%
0%100%
Low · +0.06 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 13-12-2022
    PublishedVulnerability first disclosed.
  2. 21-04-2025
    Last modifiedVulnerability information updated.

Description

Affected devices don't process correctly certain special crafted packets sent to port 102/tcp, which could allow an attacker to cause a denial of service in the device.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.93%

Chance of exploitation in the next 30 days

Percentile

60%

Versus all other CVEs

30-day change

+0.06 pp

From 0.87% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.93%

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

Siemens157 products

1 vendor · 157 products

References

1 links