Resource exhaustion in Opc Foundation Ua .Net Standard
CVE-2023-27321
OPC Foundation UA .NET Standard ConditionRefresh Resource Exhaustion Denial-of-Service Vulnerability. This vulnerability allows remote attackers to create a denial-of-service condition on affected installations of OPC Foundation UA .NET Standard. Authentication is not required to exploit this vulnerability. The specific flaw exists within the handling of OPC UA ConditionRefresh requests. By sending a large number of requests, an attacker can consume all available resources on the server. An attacker can leverage this vulnerability to create a denial-of-service condition on the system. Was ZDI-CAN-20505.
Vulnerability class: DoS (Denial of Service)
EPSS: 0.011 (61.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Opc Foundation Ua .Net Standard — versions 1.4.371.60
- Opcfoundation Ua-.netstandard
Weakness classification (CWE)
Public proof-of-concept exploits
References
- zdi-disclosures@trendmicro.com (x_research-advisory, Third Party Advisory)
- zdi-disclosures@trendmicro.com (vendor-advisory, Vendor Advisory)
Frequently asked questions
- What is CVE-2023-27321?
- CVE-2023-27321 is a high-severity vulnerability in Opc Foundation Ua .Net Standard, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2024-05-07.
- How severe is CVE-2023-27321?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2023-27321 known to be exploited?
- 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.