{"id":"CVE-2011-4871","url":"https://www.cyber-defence.io/tools/cve/CVE-2011-4871","generatedAt":"2026-10-27T19:43:56.407Z","title":"Open Automation Software OPC Systems.NET before 5.0 allows remote attackers to cause a denial of service via a malformed .NET RPC packet on TCP port 58723.","description":"Open Automation Software OPC Systems.NET before 5.0 allows remote attackers to cause a denial of service via a malformed .NET RPC packet on TCP port 58723.","published":"2012-04-18T10:33:31.000Z","lastModified":"2026-06-16T23:35:33.000Z","status":"Modified","sourceIdentifier":"cret@cert.org","cvss":{"version":"2.0","score":5,"severity":"MEDIUM","vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P"},"cwe":["CWE-20"],"affected":["opcsystems/opcsystems.net"],"epss":{"score":0.03123,"percentile":0.87759,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":1,"verified":true,"firstPublished":"2011-10-10","source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[{"edbId":17965,"kind":"exploit","title":"OPC Systems.NET 4.00.0048 - Denial of Service","url":"https://www.exploit-db.com/exploits/17965","sourceUrl":"https://gitlab.com/exploit-database/exploitdb/-/blob/main/exploits/windows/dos/17965.txt","file":"exploits/windows/dos/17965.txt","published":"2011-10-10","added":"2011-10-10","updated":"2011-10-10","author":"Luigi Auriemma","type":"dos","platform":"windows","port":null,"verified":true,"codes":["CVE-2011-4871","OSVDB-76404"],"tags":null,"aliases":null,"applicationUrl":null,"screenshotUrl":null,"referenceUrl":null}]},"verdict":{"level":"high","text":"A public exploit is published in Exploit-DB (verified), so the technical barrier is gone even though the severity is medium and EPSS is 3.1%. Treat it as high on anything reachable from the internet."},"changes":[],"references":[{"url":"http://www.us-cert.gov/control_systems/pdf/ICSA-12-012-01.pdf","tags":["US Government Resource"],"source":"cret@cert.org"},{"url":"http://www.us-cert.gov/control_systems/pdf/ICSA-12-012-01.pdf","tags":["US Government Resource"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2011-4871","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}