{"id":"CVE-2026-107613","aliases":["EUVD-2026-94977","GHSA-c4jj-c6x2-r973","UBUNTU-CVE-2026-107613"],"status":"published","title":"NULL pointer dereference in TightVNC Server Win8ScreenDriver after failed DXGI re-initialization","description":"A NULL pointer dereference vulnerability in the Win8ScreenDriver component of GlavSoft TightVNC Server for Windows before 2.8.88 allows an attacker to crash the server, causing a denial of service. When re-initialization of the DXGI Desktop Duplication driver fails in applyNewScreenProperties() (for example after a GPU reset, display hot-plug or session change), m_drvImpl is left NULL and is subsequently dereferenced without a check by executeDetection(), getScreenBuffer(), grabFb(), getScreenPropertiesChanged() and getCursorPosition().","severity":{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00308,"percentile":0.23992,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-476"],"published":"2026-10-08T13:39:56Z","modified":"2026-10-21T23:01:46Z","products":[{"vendor":"glavsoft","product":"tightvnc"},{"vendor":"kaspersky","product":"tightvnc"}],"references":[{"url":"https://sourceforge.net/p/vnc-tight/bugs/1660/","tags":["issue-tracking","report"]},{"url":"https://www.tightvnc.com/whatsnew.php","tags":["release-notes","patch","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-107613"},{"url":"https://sourceforge.net/p/vnc-tight/bugs/1660"},{"url":"https://github.com/advisories/GHSA-c4jj-c6x2-r973"},{"url":"https://ubuntu.com/security/CVE-2026-107613","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-107613","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-107613","title":"NULL pointer dereference in TightVNC Server Win8ScreenDriver after failed DXGI re-initialization","description":"A NULL pointer dereference vulnerability in the Win8ScreenDriver component of GlavSoft TightVNC Server for Windows before 2.8.88 allows an attacker to crash the server, causing a denial of service. When re-initialization of the DXGI Desktop Duplication driver fails in applyNewScreenProperties() (for example after a GPU reset, display hot-plug or session change), m_drvImpl is left NULL and is subsequently dereferenced without a check by executeDetection(), getScreenBuffer(), grabFb(), getScreenPropertiesChanged() and getCursorPosition().","status":"published","published":"2026-10-08T13:39:56.972Z","modified":"2026-10-08T14:01:33.803Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"cna"}],"cwes":["CWE-476"],"updated_at":"2026-11-02T13:45:14.072357Z"}],"euvd":[{"id":"EUVD-2026-94977","description":"A NULL pointer dereference vulnerability in the Win8ScreenDriver component of GlavSoft TightVNC Server for Windows before 2.8.88 allows an attacker to crash the server, causing a denial of service. When re-initialization of the DXGI Desktop Duplication driver fails in applyNewScreenProperties() (for example after a GPU reset, display hot-plug or session change), m_drvImpl is left NULL and is subsequently dereferenced without a check by executeDetection(), getScreenBuffer(), grabFb(), getScreenPropertiesChanged() and getCursorPosition().","status":"published","published":"2026-10-08T13:39:56Z","modified":"2026-10-08T14:01:33Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T17:27:32.642438Z"}],"ghsa":[{"id":"GHSA-c4jj-c6x2-r973","title":"A NULL pointer dereference vulnerability in the Win8ScreenDriver component of GlavSoft TightVNC...","description":"A NULL pointer dereference vulnerability in the Win8ScreenDriver component of GlavSoft TightVNC Server for Windows before 2.8.88 allows an attacker to crash the server, causing a denial of service. When re-initialization of the DXGI Desktop Duplication driver fails in applyNewScreenProperties() (for example after a GPU reset, display hot-plug or session change), m_drvImpl is left NULL and is subsequently dereferenced without a check by executeDetection(), getScreenBuffer(), grabFb(), getScreenPropertiesChanged() and getCursorPosition().","status":"published","published":"2026-10-08T15:32:59Z","modified":"2026-10-08T15:33:06Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-476"],"updated_at":"2026-11-02T15:12:57.235839Z"}],"nvd":[{"id":"CVE-2026-107613","description":"A NULL pointer dereference vulnerability in the Win8ScreenDriver component of GlavSoft TightVNC Server for Windows before 2.8.88 allows an attacker to crash the server, causing a denial of service. When re-initialization of the DXGI Desktop Duplication driver fails in applyNewScreenProperties() (for example after a GPU reset, display hot-plug or session change), m_drvImpl is left NULL and is subsequently dereferenced without a check by executeDetection(), getScreenBuffer(), grabFb(), getScreenPropertiesChanged() and getCursorPosition().","status":"published","published":"2026-10-08T14:16:50.02Z","modified":"2026-10-08T21:10:00.133Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"secondary"}],"cwes":["CWE-476"],"updated_at":"2026-11-02T14:12:55.142936Z"}],"osv":[{"id":"UBUNTU-CVE-2026-107613","description":"A NULL pointer dereference vulnerability in the Win8ScreenDriver component of GlavSoft TightVNC Server for Windows before 2.8.88 allows an attacker to crash the server, causing a denial of service. When re-initialization of the DXGI Desktop Duplication driver fails in applyNewScreenProperties() (for example after a GPU reset, display hot-plug or session change), m_drvImpl is left NULL and is subsequently dereferenced without a check by executeDetection(), getScreenBuffer(), grabFb(), getScreenPropertiesChanged() and getCursorPosition().","status":"withdrawn","published":"2026-10-13T00:00:00Z","modified":"2026-10-21T23:01:46.554451095Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T16:55:59.130573Z"}]}}