CVE-2021-27432
HIGHCVSS 7.5/10EPSS 2.19%
Last modified
CVE-2021-27432 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. EPSS estimates a 2.19% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Opcfoundation | Ua-.Net-Legacy | All versions |
| Opcfoundation | Ua .Net Standard Stack | < 1.4.365.48 |
References
- https://us-cert.cisa.gov/ics/advisories/icsa-21-133-03Third Party Advisory, US Government Resource
- https://us-cert.cisa.gov/ics/advisories/icsa-21-133-03Third Party Advisory, US Government Resource
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-27432?
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.
How severe is CVE-2021-27432?
CVE-2021-27432 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 2.19% probability of exploitation in the next 30 days.
How do I fix CVE-2021-27432?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-27432?
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Scan your code nowSource: NVD / NIST