{"id":"CVE-2018-20020","url":"https://www.cyber-defence.io/tools/cve/CVE-2018-20020","generatedAt":"2026-10-28T20:26:56.302Z","title":"LibVNC before commit 7b1ef0ffc4815cab9a96c7278394152bdc89dc4d contains heap out-of-bound write vulnerability inside structure in VNC client code that can result remote code execution","description":"LibVNC before commit 7b1ef0ffc4815cab9a96c7278394152bdc89dc4d contains heap out-of-bound write vulnerability inside structure in VNC client code that can result remote code execution","published":"2018-12-19T16:29:00.000Z","lastModified":"2026-06-17T01:52:11.000Z","status":"Modified","sourceIdentifier":"vulnerability@kaspersky.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":["libvnc project/libvncserver","canonical/ubuntu linux","debian/debian linux"],"epss":{"score":0.08786,"percentile":0.95149,"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":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (8.79%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://ics-cert.kaspersky.com/advisories/klcert-advisories/2018/12/19/klcert-18-030-libvnc-heap-out-of-bound-write/","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://lists.debian.org/debian-lts-announce/2019/11/msg00033.html","source":"vulnerability@kaspersky.com"},{"url":"https://security.gentoo.org/glsa/201908-05","source":"vulnerability@kaspersky.com"},{"url":"https://security.gentoo.org/glsa/202006-06","source":"vulnerability@kaspersky.com"},{"url":"https://usn.ubuntu.com/3877-1/","tags":["Third Party Advisory"],"source":"vulnerability@kaspersky.com"},{"url":"https://usn.ubuntu.com/4547-1/","source":"vulnerability@kaspersky.com"},{"url":"https://usn.ubuntu.com/4547-2/","source":"vulnerability@kaspersky.com"},{"url":"https://usn.ubuntu.com/4587-1/","source":"vulnerability@kaspersky.com"},{"url":"https://www.debian.org/security/2019/dsa-4383","tags":["Third Party Advisory"],"source":"vulnerability@kaspersky.com"},{"url":"https://ics-cert.kaspersky.com/advisories/klcert-advisories/2018/12/19/klcert-18-030-libvnc-heap-out-of-bound-write/","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://lists.debian.org/debian-lts-announce/2019/11/msg00033.html","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.gentoo.org/glsa/201908-05","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.gentoo.org/glsa/202006-06","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://usn.ubuntu.com/4547-1/","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://usn.ubuntu.com/4547-2/","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://usn.ubuntu.com/4587-1/","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-2018-20020","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."}