{"id":"CVE-2021-20093","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-20093","generatedAt":"2026-11-05T01:17:44.192Z","title":"A buffer over-read vulnerability exists in Wibu-Systems CodeMeter versions < 7.21a.","description":"A buffer over-read vulnerability exists in Wibu-Systems CodeMeter versions < 7.21a. An unauthenticated remote attacker can exploit this issue to disclose heap memory contents or crash the CodeMeter Runtime Server.","published":"2021-06-16T12:15:12.000Z","lastModified":"2026-06-17T03:33:16.000Z","status":"Modified","sourceIdentifier":"vulnreport@tenable.com","cvss":{"version":"3.1","score":9.1,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H"},"cwe":["CWE-125"],"affected":["wibu/codemeter","siemens/pss cape","siemens/sicam 230 firmware","siemens/simatic information server","siemens/simatic pcs neo","siemens/simatic wincc oa","siemens/simit simulation platform","siemens/sinec infrastructure network services","siemens/sinema remote connect server","siemens/simatic process historian"],"epss":{"score":0.33304,"percentile":0.98375,"date":"2026-11-03","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"urgent","text":"EPSS puts the probability of exploitation in the next 30 days at 33.3%, higher than 98% of all known CVEs. Patch or mitigate before the next change window."},"changes":[],"references":[{"url":"https://cdn.wibu.com/fileadmin/wibu_downloads/security_advisories/Advisory_WIBU-210423-01.pdf","tags":["Mitigation","Vendor Advisory"],"source":"vulnreport@tenable.com"},{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-675303.pdf","tags":["Patch","Third Party Advisory"],"source":"vulnreport@tenable.com"},{"url":"https://us-cert.cisa.gov/ics/advisories/icsa-21-210-02","tags":["Third Party Advisory","US Government Resource"],"source":"vulnreport@tenable.com"},{"url":"https://www.tenable.com/security/research/tra-2021-24","tags":["Exploit","Patch","Third Party Advisory"],"source":"vulnreport@tenable.com"},{"url":"https://cdn.wibu.com/fileadmin/wibu_downloads/security_advisories/Advisory_WIBU-210423-01.pdf","tags":["Mitigation","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-675303.pdf","tags":["Patch","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://us-cert.cisa.gov/ics/advisories/icsa-21-210-02","tags":["Third Party Advisory","US Government Resource"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.tenable.com/security/research/tra-2021-24","tags":["Exploit","Patch","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-20093","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."}