{"id":"CVE-2019-8258","url":"https://www.cyber-defence.io/tools/cve/CVE-2019-8258","generatedAt":"2026-10-27T21:18:30.038Z","title":"UltraVNC revision 1198 has a heap buffer overflow vulnerability in VNC client code which results code execution.","description":"UltraVNC revision 1198 has a heap buffer overflow vulnerability in VNC client code which results code execution. This attack appears to be exploitable via network connectivity. This vulnerability has been fixed in revision 1199.","published":"2019-03-05T15:29:00.000Z","lastModified":"2026-06-17T02:41:46.000Z","status":"Modified","sourceIdentifier":"vulnerability@kaspersky.com","cvss":{"version":"3.1","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"},"cwe":["CWE-122","CWE-787"],"affected":["uvnc/ultravnc","siemens/sinumerik access mymachine\\/p2p","siemens/sinumerik pcu base win10 software\\/ipc","siemens/sinumerik pcu base win7 software\\/ipc"],"epss":{"score":0.04434,"percentile":0.91321,"date":"2026-10-26","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 (4.43%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-927095.pdf","tags":["Third Party Advisory"],"source":"vulnerability@kaspersky.com"},{"url":"https://ics-cert.kaspersky.com/advisories/klcert-advisories/2019/03/01/klcert-19-004-ultravnc-heap-based-buffer-overflow/","tags":["Third Party Advisory"],"source":"vulnerability@kaspersky.com"},{"url":"https://www.us-cert.gov/ics/advisories/icsa-20-161-06","tags":["Third Party Advisory","US Government Resource"],"source":"vulnerability@kaspersky.com"},{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-927095.pdf","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://ics-cert.kaspersky.com/advisories/klcert-advisories/2019/03/01/klcert-19-004-ultravnc-heap-based-buffer-overflow/","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.us-cert.gov/ics/advisories/icsa-20-161-06","tags":["Third Party Advisory","US Government Resource"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2019-8258","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."}