{"id":"CVE-2018-20023","url":"https://www.cyber-defence.io/tools/cve/CVE-2018-20023","generatedAt":"2026-10-28T20:12:12.428Z","title":"LibVNC before 8b06f835e259652b0ff026898014fc7297ade858 contains CWE-665: Improper Initialization vulnerability in VNC Repeater client code that allows attacker to read stack memory and can be abuse for information disclosure.","description":"LibVNC before 8b06f835e259652b0ff026898014fc7297ade858 contains CWE-665: Improper Initialization vulnerability in VNC Repeater client code that allows attacker to read stack memory and can be abuse for information disclosure. Combined with another vulnerability, it can be used to leak stack memory layout and in bypassing ASLR","published":"2018-12-19T16:29:01.000Z","lastModified":"2026-06-17T01:52:11.000Z","status":"Modified","sourceIdentifier":"vulnerability@kaspersky.com","cvss":{"version":"3.0","score":7.5,"severity":"HIGH","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"},"cwe":["CWE-665"],"affected":["libvnc project/libvncserver","debian/debian linux","canonical/ubuntu linux"],"epss":{"score":0.02495,"percentile":0.8459,"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 (2.50%). 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-18-033-libvnc-memory-leak/","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://security.gentoo.org/glsa/201908-05","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/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-18-033-libvnc-memory-leak/","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://security.gentoo.org/glsa/201908-05","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/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-2018-20023","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."}