CVE-2021-27432
CVE-2021-27432 is a high-severity vulnerability in Opcfoundation Ua-.net-legacy with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-674.
Key facts
- Severity: High (CVSS 3.x base score 7.5)
- CVSS v2: 5.0
- EPSS exploit prediction: 2% (80th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-674
- Affected product: Opcfoundation Ua-.net-legacy
- Published:
- Last modified:
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.
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 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
- Is CVE-2021-27432 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (80th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2021-27432?
- CVE-2021-27432 primarily affects Opcfoundation Ua-.net-legacy. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2021-27432?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- When was CVE-2021-27432 published?
- CVE-2021-27432 was published on 2021-05-20 and last updated on 2026-06-17.
References
Affected products (2)
- cpe:2.3:a:opcfoundation:ua-.net-legacy:-:*:*:*:*:*:*:*
- cpe:2.3:a:opcfoundation:ua_.net_standard_stack:*:*:*:*:*:*:*:*
More vulnerabilities in Opcfoundation Ua-.net-legacy
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- CVE-2018-12087 — Medium (CVSS 5.3): Failure to validate certificates in OPC Foundation UA Client Applications communicating without security allows…
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