5.3

CVE-2020-12526: beckhoff ipc_diagnostics_ua_server Improper Input Validation

CVSS: 5.3v3.1MediumModified
Published 13-05-2021Last modified 16-09-2024
Open JSON

Vulnerability summary

CVE-2020-12526 is a medium (CVSS 5.3) Improper Input Validation vulnerability in beckhoff ipc_diagnostics_ua_server. EPSS estimates a 0.95% chance of exploitation in the next 30 days, higher than 60.9% of scored vulnerabilities.

Overall risk
21/100
0100
Low · default modelHow is this calculated?
CVSS score
5.3/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.95%
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. 13-05-2021
    PublishedVulnerability first disclosed.
  2. 16-09-2024
    Last modifiedVulnerability information updated.

Description

TwinCAT OPC UA Server in versions up to 2.3.0.12 and IPC Diagnostics UA Server in versions up to 3.1.0.1 from Beckhoff Automation GmbH & Co. KG are vulnerable to denial of service attacks. The attacker needs to send several specifically crafted requests to the running OPC UA server. After some of these requests the OPC UA server is no longer responsive to any client. This is without effect to the real-time functionality of IPCs.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

0.95%

Chance of exploitation in the next 30 days

Percentile

61%

Versus all other CVEs

30-day change

0.00 pp

From 0.95% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.95%

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

Beckhoff3 products

1 vendor · 3 products

References

2 links