What’s Vulnerable › Vulnerabilities

CVE-2021-27432

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-05-20 · updated 2026-06-17
• Weakness: CWE-674

Description

OPC Foundation UA .NET Standard versions prior to 1.4.365.48 and OPC UA .NET Legacy are vulnerable to an uncontrolled recursion, which may allow an attacker to trigger a stack overflow.

Affected products

• Opcfoundation Ua-.Net-Legacy: all versions
• Opcfoundation Ua .Net Standard Stack: before 1.4.365.48 — fixed in 1.4.365.48

How to fix

Upgrade to a fixed version: Opcfoundation Ua .Net Standard Stack 1.4.365.48. Check the vendor advisory for mitigations.

References

• https://us-cert.cisa.gov/ics/advisories/icsa-21-133-03
• https://us-cert.cisa.gov/ics/advisories/icsa-21-133-03

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