{"schemaVersion":3,"id":"CVE-2019-20788","aliases":["MGASA-2020-0207","UBUNTU-CVE-2019-20788","DEBIAN-CVE-2019-20788"],"status":"published","duplicateOf":null,"title":null,"description":"libvncclient/cursor.c in LibVNCServer through 0.9.12 has a HandleCursorShape integer overflow and heap-based buffer overflow via a large height or width value. NOTE: this may overlap CVE-2019-15690.","dates":{"published":"2020-04-23T18:06:55.000Z","modified":"2024-08-05T02:53:09.241Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":9.8,"severity":"critical","version":"3.1","versionLabel":"v3.1","source":"NVD","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","score":9.8,"severity":"critical","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","exploitability":10,"impact":9.8,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Debian","score":9.8,"severity":"critical","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","exploitability":10,"impact":9.8,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":9.8,"severity":"critical","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false},{"version":"2.0","versionLabel":"v2.0","source":"NVD","score":7.5,"severity":"high","vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.02497,"percentile":0.84454,"severity":"low","asOf":"2026-10-19T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-19T00:00:00.000Z","baselineScore":0.02497},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.02497,"percentile":0.84454}],"last30":[{"date":"2026-09-19T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.02497,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.02497,"percentile":0.84454}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[{"id":"GITHUB_ADVISORIES_GHSL-2020-064-LIBVNC-LIBVNCCLIENT","name":"Ghsl 2020 064 Libvnc Libvncclient","source":"github","url":"https://securitylab.github.com/advisories/GHSL-2020-064-libvnc-libvncclient","maturity":"poc","reliabilityScore":0.3,"verified":false,"type":null,"platforms":[],"requiresAuth":null,"exploitdb":null,"metasploit":null}],"exploitCount":1,"weaknesses":[{"id":"CWE-190","name":"Integer Overflow or Wraparound","description":"The product performs a calculation that can\n         produce an integer overflow or wraparound when the logic\n         assumes that the resulting value will always be larger than\n         the original value. This occurs when an integer value is\n         incremented to a value that is too large to store in the\n         associated representation. When this occurs, the value may\n         become a very small or negative number.","type":"weakness","status":"Stable","abstraction":"Base","likelihoodOfExploit":"Medium","url":"https://cwe.mitre.org/data/definitions/190.html"},{"id":"CWE-787","name":"Out-of-bounds Write","description":"The product writes data past the end, or before the beginning, of the intended buffer.","type":"weakness","status":"Draft","abstraction":"Base","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/787.html"}],"affected":[{"vendor":"canonical","product":"ubuntu_linux","name":"ubuntu linux","label":"ubuntu_linux","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"14.04","noFixRecorded":false,"fixedIn":null},{"text":"16.04","noFixRecorded":false,"fixedIn":null},{"text":"18.04","noFixRecorded":false,"fixedIn":null},{"text":"18.10","noFixRecorded":false,"fixedIn":null}],"versionsText":"14.04 | 16.04 | 18.04 | 18.10","eol":{"isEol":true,"eolDate":"2019-04-02T00:00:00.000Z","matchMethod":"cpe","cycle":{"name":"14.04","label":"14.04 'Trusty Tahr' (LTS)","eolFrom":"2019-04-02T00:00:00.000Z","isLts":true,"isMaintained":false,"latestVersion":"14.04.6"},"product":{"name":"ubuntu","label":"Ubuntu","category":"os"}},"hubHref":"/vendor/canonical/ubuntu_linux"},{"vendor":"debian","product":"libvncserver","name":"libvncserver","label":"libvncserver","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/libvncserver","purlType":"deb","versions":[{"text":"< 0.9.12+dfsg-9","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 0.9.12+dfsg-9","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"libvncserver","name":"libvncserver","label":"libvncserver","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/libvncserver","purlType":"deb","versions":[{"text":"< 0.9.10+dfsg-3ubuntu0.16.04.4","noFixRecorded":false,"fixedIn":null},{"text":"< 0.9.11+dfsg-1ubuntu1.2","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 0.9.10+dfsg-3ubuntu0.16.04.4 | < 0.9.11+dfsg-1ubuntu1.2","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"x11vnc","name":"x11vnc","label":"x11vnc","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/x11vnc","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"debian","product":"debian_linux","name":"debian linux","label":"debian_linux","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"8.0","noFixRecorded":false,"fixedIn":null},{"text":"9.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"8.0 | 9.0","eol":{"isEol":true,"eolDate":"2020-06-30T00:00:00.000Z","matchMethod":"cpe","cycle":{"name":"8","label":"8 (Jessie)","eolFrom":"2020-06-30T00:00:00.000Z","isLts":false,"isMaintained":false,"latestVersion":"8.11"},"product":{"name":"debian","label":"Debian","category":"os"}},"hubHref":"/vendor/debian/debian_linux"},{"vendor":"libvnc_project","product":"libvncserver","name":"libvncserver","label":"libvncserver","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≤ 0.9.12","noFixRecorded":false,"fixedIn":null}],"versionsText":"≤ 0.9.12","eol":null,"hubHref":"/vendor/libvnc_project/libvncserver"},{"vendor":"mageia","product":"libvncserver","name":"libvncserver","label":"libvncserver","ecosystem":"Mageia","cpePart":null,"purl":"pkg:rpm/mageia/libvncserver","purlType":"rpm","versions":[{"text":"< 0.9.12-2.3.mga7","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 0.9.12-2.3.mga7","eol":null,"hubHref":null},{"vendor":"siemens","product":"simatic_itc1500_firmware","name":"simatic itc1500 firmware","label":"simatic_itc1500_firmware","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"≥ 3.0.0.0, < 3.2.1.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 3.0.0.0, < 3.2.1.0","eol":null,"hubHref":"/vendor/siemens/simatic_itc1500"},{"vendor":"siemens","product":"simatic_itc1500_pro_firmware","name":"simatic itc1500 pro firmware","label":"simatic_itc1500_pro_firmware","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"≥ 3.0.0.0, < 3.2.1.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 3.0.0.0, < 3.2.1.0","eol":null,"hubHref":"/vendor/siemens/simatic_itc1500_pro"},{"vendor":"siemens","product":"simatic_itc1900_firmware","name":"simatic itc1900 firmware","label":"simatic_itc1900_firmware","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"≥ 3.0.0.0, < 3.2.1.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 3.0.0.0, < 3.2.1.0","eol":null,"hubHref":"/vendor/siemens/simatic_itc1900"},{"vendor":"siemens","product":"simatic_itc1900_pro_firmware","name":"simatic itc1900 pro firmware","label":"simatic_itc1900_pro_firmware","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"≥ 3.0.0.0, < 3.2.1.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 3.0.0.0, < 3.2.1.0","eol":null,"hubHref":"/vendor/siemens/simatic_itc1900_pro"},{"vendor":"siemens","product":"simatic_itc2200_firmware","name":"simatic itc2200 firmware","label":"simatic_itc2200_firmware","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"≥ 3.0.0.0, < 3.2.1.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 3.0.0.0, < 3.2.1.0","eol":null,"hubHref":"/vendor/siemens/simatic_itc2200"},{"vendor":"siemens","product":"simatic_itc2200_pro_firmware","name":"simatic itc2200 pro firmware","label":"simatic_itc2200_pro_firmware","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"≥ 3.0.0.0, < 3.2.1.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 3.0.0.0, < 3.2.1.0","eol":null,"hubHref":"/vendor/siemens/simatic_itc2200_pro"}],"affectedCount":13,"eol":{"hasEol":true,"count":2},"references":[{"url":"https://github.com/LibVNC/libvncserver/commit/54220248886b5001fbbb9fa73c4e1a2cb9413fed","label":"github.com/LibVNC/libvncserver/commit/54220248886b5001fbbb9fa73c4e1a2cb9413fed","hostname":"github.com","tags":["X Refsource MISC","Patch","Third Party Advisory"]},{"url":"http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00027.html","label":"lists.opensuse.org/opensuse-security-announce/2020-05/msg00027.html","hostname":"lists.opensuse.org","tags":["Vendor Advisory","X Refsource SUSE","Mailing List","Third Party Advisory"]},{"url":"https://usn.ubuntu.com/4407-1/","label":"usn.ubuntu.com/4407-1/","hostname":"usn.ubuntu.com","tags":["Vendor Advisory","X Refsource UBUNTU","Third Party Advisory"]},{"url":"https://securitylab.github.com/advisories/GHSL-2020-064-libvnc-libvncclient","label":"securitylab.github.com/advisories/GHSL-2020-064-libvnc-libvncclient","hostname":"securitylab.github.com","tags":["X Refsource MISC","Exploit","Third Party Advisory"]},{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-390195.pdf","label":"cert-portal.siemens.com/productcert/pdf/ssa-390195.pdf","hostname":"cert-portal.siemens.com","tags":["X Refsource CONFIRM","Patch","Third Party Advisory"]},{"url":"https://advisories.mageia.org/MGASA-2020-0207.html","label":"advisories.mageia.org/MGASA-2020-0207.html","hostname":"advisories.mageia.org","tags":["Advisory"]},{"url":"https://bugs.mageia.org/show_bug.cgi?id=26587","label":"bugs.mageia.org/show_bug.cgi?id=26587","hostname":"bugs.mageia.org","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2019-20788","label":"ubuntu.com/security/CVE-2019-20788","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/notices/USN-4407-1","label":"ubuntu.com/security/notices/USN-4407-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2019-20788","label":"www.cve.org/CVERecord?id=CVE-2019-20788","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2019-20788","label":"security-tracker.debian.org/tracker/CVE-2019-20788","hostname":"security-tracker.debian.org","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":["DLA-2146-1","OPENSUSE-SU-2020:0624-1","RHSA-2020:0913","RHSA-2020:0920","RHSA-2020:0921","SUSE-SU-2020:1164-1","SUSE-SU-2020:1164-2","SUSE-SU-2020:1165-1","SUSE-SU-2020:14355-1","USN-4407-1"],"duplicates":[],"related":["OPENSUSE-SU-2020:0624-1","SUSE-SU-2020:1164-1","SUSE-SU-2020:1164-2","SUSE-SU-2020:1165-1","SUSE-SU-2020:14355-1","USN-4407-1"]},"timeline":[{"kind":"published","date":"2020-04-23T18:06:55.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2024-08-05T02:53:09.241Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":70,"level":"high","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-19T15:44:58.025Z","stale":false,"partial":false}}