{"id":"CVE-2019-8268","aliases":["EUVD-2019-17666","GHSA-h835-4p8w-83c9"],"status":"published","title":"UltraVNC revision 1206 has multiple off-by-one vulnerabilities in VNC client code connected with...","description":"UltraVNC revision 1206 has multiple off-by-one vulnerabilities in VNC client code connected with improper usage of ClientConnection::ReadString function, which can potentially result code execution. This attack appears to be exploitable via network connectivity. These vulnerabilities have been fixed in revision 1207.","severity":{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.0392,"percentile":0.90417,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-193"],"published":"2019-03-08T23:29:00.623Z","modified":"2026-06-17T02:41:46Z","products":[{"vendor":"kaspersky lab","product":"ultravnc"},{"vendor":"siemens","product":"sinumerik_access_mymachine\\/p2p"},{"vendor":"siemens","product":"sinumerik_pcu_base_win10_software\\/ipc"},{"vendor":"siemens","product":"sinumerik_pcu_base_win7_software\\/ipc"},{"vendor":"uvnc","product":"ultravnc"}],"references":[{"url":"https://ics-cert.kaspersky.com/advisories/klcert-advisories/2019/03/01/klcert-19-015-ultravnc-off-by-one-error/","tags":["x_refsource_MISC","x_transferred","Third Party Advisory"]},{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-927095.pdf","tags":["x_refsource_CONFIRM","x_transferred","Third Party Advisory"]},{"url":"https://www.us-cert.gov/ics/advisories/icsa-20-161-06","tags":["x_refsource_MISC","x_transferred","Third Party Advisory","US Government Resource"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2019-8268"},{"url":"https://github.com/advisories/GHSA-h835-4p8w-83c9"}],"sources":{"cve":[{"id":"CVE-2019-8268","description":"UltraVNC revision 1206 has multiple off-by-one vulnerabilities in VNC client code connected with improper usage of ClientConnection::ReadString function, which can potentially result code execution. This attack appears to be exploitable via network connectivity. These vulnerabilities have been fixed in revision 1207.","status":"published","published":"2019-03-09T00:00:00Z","modified":"2024-09-17T01:16:16.319Z","cwes":["CWE-193"],"updated_at":"2026-11-02T14:20:21.703364Z"}],"euvd":[{"id":"EUVD-2019-17666","description":"UltraVNC revision 1206 has multiple off-by-one vulnerabilities in VNC client code connected with improper usage of ClientConnection::ReadString function, which can potentially result code execution. This attack appears to be exploitable via network connectivity. These vulnerabilities have been fixed in revision 1207.","status":"published","published":"2019-03-09T00:00:00Z","modified":"2024-09-17T01:16:16Z","updated_at":"2026-11-03T00:28:51.310992Z"}],"ghsa":[{"id":"GHSA-h835-4p8w-83c9","title":"UltraVNC revision 1206 has multiple off-by-one vulnerabilities in VNC client code connected with...","description":"UltraVNC revision 1206 has multiple off-by-one vulnerabilities in VNC client code connected with improper usage of ClientConnection::ReadString function, which can potentially result code execution. This attack appears to be exploitable via network connectivity. These vulnerabilities have been fixed in revision 1207.","status":"published","published":"2022-05-13T01:14:29Z","modified":"2023-02-01T05:04:17Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-193"],"updated_at":"2026-11-02T14:50:08.898362Z"}],"nvd":[{"id":"CVE-2019-8268","description":"UltraVNC revision 1206 has multiple off-by-one vulnerabilities in VNC client code connected with improper usage of ClientConnection::ReadString function, which can potentially result code execution. This attack appears to be exploitable via network connectivity. These vulnerabilities have been fixed in revision 1207.","status":"published","published":"2019-03-08T23:29:00.623Z","modified":"2026-06-17T02:41:46.94Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"2.0","score":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","level":"high","assessor":"primary"}],"cwes":["CWE-193"],"updated_at":"2026-11-02T14:05:07.268578Z"}]}}