{"id":"CVE-2023-27321","state":"PUBLISHED","title":"OPC Foundation UA .NET Standard ConditionRefresh Resource Exhaustion Denial-of-Service Vulnerability","description":"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.\n\nThe 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.","publishedAt":"2024-05-07T22:55:01.898Z","updatedAt":"2024-08-02T12:09:43.438Z","severity":{"score":7.5,"label":"High","version":"3.0","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","source":"zdi"},"assigner":"zdi","products":["OPC Foundation UA .NET Standard"],"affected":[{"vendor":"OPC Foundation","product":"UA .NET Standard","defaultStatus":"unknown","versions":[{"version":"1.4.371.60","status":"affected"}]}],"references":["https://www.zerodayinitiative.com/advisories/ZDI-23-548/","https://files.opcfoundation.org/SecurityBulletins/OPC%20Foundation%20Security%20Bulletin%20CVE-2023-27321.pdf"],"weaknesses":["CWE-400"],"ingestedAt":"2026-10-29T20:05:52.290Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2023/27xxx/CVE-2023-27321.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2023-27321","state":"PUBLISHED","datePublished":"2024-05-07T22:55:01.898Z","dateUpdated":"2024-08-02T12:09:43.438Z","assignerShortName":"zdi","assignerOrgId":"99f1926a-a320-47d8-bbb5-42feb611262e","dateReserved":"2023-02-28T17:58:45.477Z"},"containers":{"cna":{"title":"OPC Foundation UA .NET Standard ConditionRefresh Resource Exhaustion Denial-of-Service Vulnerability","descriptions":[{"lang":"en","value":"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.\n\nThe 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."}],"affected":[{"vendor":"OPC Foundation","product":"UA .NET Standard","defaultStatus":"unknown","versions":[{"version":"1.4.371.60","status":"affected"}]}],"references":[{"url":"https://www.zerodayinitiative.com/advisories/ZDI-23-548/","name":"ZDI-23-548","tags":["x_research-advisory"]},{"url":"https://files.opcfoundation.org/SecurityBulletins/OPC%20Foundation%20Security%20Bulletin%20CVE-2023-27321.pdf","name":"vendor-provided URL","tags":["vendor-advisory"]}],"metrics":[{"format":"CVSS","cvssV3_0":{"version":"3.0","vectorString":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":7.5,"baseSeverity":"HIGH"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-400","lang":"en","description":"CWE-400: Uncontrolled Resource Consumption ('Resource Exhaustion')","type":"CWE"}]}],"providerMetadata":{"shortName":"zdi","orgId":"99f1926a-a320-47d8-bbb5-42feb611262e","dateUpdated":"2024-05-07T22:55:01.898Z"},"dateAssigned":"2023-02-28T18:05:53.841Z","datePublic":"2023-05-04T22:17:13.102Z","source":{"lang":"en","value":"Claroty Research - Team82 - Uri Katz, Noam Moshe, Vera Mens, Sharon Brizinov"}},"adp":[{"title":"CISA ADP Vulnrichment","affected":[{"vendor":"opcfoundation","product":"unified_architecture_.net-standard","defaultStatus":"unknown","versions":[{"version":"1.4.371.60","status":"affected"}],"cpes":["cpe:2.3:a:opcfoundation:unified_architecture_.net-standard:*:*:*:*:*:*:*:*"]}],"metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2023-27321","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2024-05-08T15:27:13.124910Z"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2024-06-04T17:24:44.157Z"}},{"title":"CVE Program Container","references":[{"url":"https://www.zerodayinitiative.com/advisories/ZDI-23-548/","name":"ZDI-23-548","tags":["x_research-advisory","x_transferred"]},{"url":"https://files.opcfoundation.org/SecurityBulletins/OPC%20Foundation%20Security%20Bulletin%20CVE-2023-27321.pdf","name":"vendor-provided URL","tags":["vendor-advisory","x_transferred"]}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2024-08-02T12:09:43.438Z"}}]}}}