{"id":"CVE-2018-3991","url":"https://www.cyber-defence.io/tools/cve/CVE-2018-3991","generatedAt":"2026-10-28T21:27:45.137Z","title":"An exploitable heap overflow vulnerability exists in the WkbProgramLow function of WibuKey Network server management, version 6.40.2402.500.","description":"An exploitable heap overflow vulnerability exists in the WkbProgramLow function of WibuKey Network server management, version 6.40.2402.500. A specially crafted TCP packet can cause a heap overflow, potentially leading to remote code execution. An attacker can send a malformed TCP packet to trigger this vulnerability.","published":"2019-02-05T23:29:00.000Z","lastModified":"2026-06-17T01:58:11.000Z","status":"Modified","sourceIdentifier":"talos-cna@cisco.com","cvss":{"version":"3.0","score":9.8,"severity":"CRITICAL","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"cwe":["CWE-787"],"affected":["wibu/wibukey","siemens/simatic wincc open architecture"],"epss":{"score":0.34329,"percentile":0.984,"date":"2026-10-27","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 34.3%, higher than 98% of all known CVEs. Patch or mitigate before the next change window."},"changes":[],"references":[{"url":"http://www.securityfocus.com/bid/107005","tags":["Third Party Advisory","VDB Entry"],"source":"talos-cna@cisco.com"},{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-760124.pdf","tags":["Mitigation","Third Party Advisory"],"source":"talos-cna@cisco.com"},{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-844562.pdf","tags":["Third Party Advisory"],"source":"talos-cna@cisco.com"},{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-902727.pdf","source":"talos-cna@cisco.com"},{"url":"https://talosintelligence.com/vulnerability_reports/TALOS-2018-0659","tags":["Exploit","Third Party Advisory"],"source":"talos-cna@cisco.com"},{"url":"http://www.securityfocus.com/bid/107005","tags":["Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-760124.pdf","tags":["Mitigation","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-844562.pdf","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-902727.pdf","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://talosintelligence.com/vulnerability_reports/TALOS-2018-0659","tags":["Exploit","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2018-3991","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."}