What’s Vulnerable › Vulnerabilities

CVE-2021-45117

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2022-03-21 · updated 2026-06-17
• Weakness: CWE-476

Description

The OPC autogenerated ANSI C stack stubs (in the NodeSets) do not handle all error cases. This can lead to a NULL pointer dereference.

Affected products

• Opcfoundation Ua-Nodeset: before 1.05.01 — fixed in 1.05.01
• Siemens Simatic Net Pc: 14, 15, 16, 17
• Siemens SITOP Manager: all versions
• Siemens TeleControl Server Basic: 3.0

How to fix

Upgrade to a fixed version: Opcfoundation Ua-Nodeset 1.05.01. Check the vendor advisory for mitigations.

References

• https://cert-portal.siemens.com/productcert/pdf/ssa-285795.pdf
• https://files.opcfoundation.org/SecurityBulletins/OPC%20Foundation%20Security%20Bulletin%20CVE-2021-45117.pdf
• https://www.youtube.com/watch?v=qv-RBdCaV4k
• https://cert-portal.siemens.com/productcert/pdf/ssa-285795.pdf
• https://files.opcfoundation.org/SecurityBulletins/OPC%20Foundation%20Security%20Bulletin%20CVE-2021-45117.pdf
• https://www.youtube.com/watch?v=qv-RBdCaV4k

Get alerted when CVE-2021-45117 or the next vulnerability affects your stack