{"id":"CVE-2018-6307","url":"https://www.cyber-defence.io/tools/cve/CVE-2018-6307","generatedAt":"2026-10-29T00:48:49.871Z","title":"LibVNC before commit ca2a5ac02fbbadd0a21fabba779c1ea69173d10b contains heap use-after-free vulnerability in server code of file transfer extension that can result remote code execution.","description":"LibVNC before commit ca2a5ac02fbbadd0a21fabba779c1ea69173d10b contains heap use-after-free vulnerability in server code of file transfer extension that can result remote code execution.","published":"2018-12-19T16:29:01.000Z","lastModified":"2026-06-17T02:01:38.000Z","status":"Modified","sourceIdentifier":"vulnerability@kaspersky.com","cvss":{"version":"3.0","score":8.1,"severity":"HIGH","vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"},"cwe":["CWE-416"],"affected":["libvnc project/libvncserver","canonical/ubuntu linux","debian/debian linux"],"epss":{"score":0.26543,"percentile":0.98004,"date":"2026-10-27","history":[{"date":"2026-09-21","score":0.1838,"percentile":0.97168},{"date":"2026-09-22","score":0.26543,"percentile":0.97921}]},"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 26.5%, higher than 98% of all known CVEs. Patch or mitigate before the next change window."},"changes":[{"kind":"epss","label":"EPSS jump","at":"2026-09-22T00:00:00.000Z","detail":{"to":0.26543,"from":0.1838,"percentile":0.97921},"summary":"EPSS moved from 18.4% to 26.5% probability of exploitation in the next thirty days."}],"references":[{"url":"https://ics-cert.kaspersky.com/advisories/klcert-advisories/2018/12/19/klcert-18-026-libvnc-heap-use-after-free/","tags":["Third Party Advisory"],"source":"vulnerability@kaspersky.com"},{"url":"https://lists.debian.org/debian-lts-announce/2018/12/msg00017.html","tags":["Mailing List","Third Party Advisory"],"source":"vulnerability@kaspersky.com"},{"url":"https://lists.debian.org/debian-lts-announce/2019/10/msg00042.html","source":"vulnerability@kaspersky.com"},{"url":"https://usn.ubuntu.com/3877-1/","tags":["Third Party Advisory"],"source":"vulnerability@kaspersky.com"},{"url":"https://www.debian.org/security/2019/dsa-4383","tags":["Third Party Advisory"],"source":"vulnerability@kaspersky.com"},{"url":"https://github.com/LibVNC/libvncserver/issues/241","tags":["Third Party Advisory"],"source":"nvd@nist.gov"},{"url":"https://ics-cert.kaspersky.com/advisories/klcert-advisories/2018/12/19/klcert-18-026-libvnc-heap-use-after-free/","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.debian.org/debian-lts-announce/2018/12/msg00017.html","tags":["Mailing List","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.debian.org/debian-lts-announce/2019/10/msg00042.html","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://usn.ubuntu.com/3877-1/","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.debian.org/security/2019/dsa-4383","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2018-6307","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."}