{"id":"CVE-2024-21885","title":"Xorg-x11-server: heap buffer overflow in xisenddevicehierarchyevent","summary":"A flaw was found in X.Org server. In the XISendDeviceHierarchyEvent function, it is possible to exceed the allocated array length when certain new device IDs are added to the xXIHierarchyInfo struct. This can trigger a heap buffer overfl…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","cwe":["CWE-122"],"vendor":"Red Hat","product":"xorg-server","affected":["xorg-server < 21.1.11","xwayland < 23.2.4","tigervnc (all versions)","xorg-x11-server (all versions)","tigervnc (all versions)","tigervnc (all versions)","xorg-x11-server (all versions)","xorg-x11-server-Xwayland (all versions)","tigervnc (all versions)","tigervnc (all versions)","tigervnc (all versions)","tigervnc (all versions)","tigervnc (all versions)","tigervnc (all versions)","tigervnc (all versions)","tigervnc (all versions)","tigervnc (all versions)","xorg-x11-server (all versions)","xorg-x11-server-Xwayland (all versions)","tigervnc (all versions)","tigervnc (all versions)","xorg-x11-server"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2024-04-26T16:17:45.889071Z"},"published":"2024-02-28","updated":"2026-11-04","sourceUpdated":"2026-11-04T21:10:01.871Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2024-21885","references":[{"url":"https://access.redhat.com/errata/RHSA-2024:0320","label":"RHSA-2024:0320"},{"url":"https://access.redhat.com/errata/RHSA-2024:0557","label":"RHSA-2024:0557"},{"url":"https://access.redhat.com/errata/RHSA-2024:0558","label":"RHSA-2024:0558"},{"url":"https://access.redhat.com/errata/RHSA-2024:0597","label":"RHSA-2024:0597"},{"url":"https://access.redhat.com/errata/RHSA-2024:0607","label":"RHSA-2024:0607"},{"url":"https://access.redhat.com/errata/RHSA-2024:0614","label":"RHSA-2024:0614"},{"url":"https://access.redhat.com/errata/RHSA-2024:0617","label":"RHSA-2024:0617"},{"url":"https://access.redhat.com/errata/RHSA-2024:0621","label":"RHSA-2024:0621"},{"url":"https://access.redhat.com/errata/RHSA-2024:0626","label":"RHSA-2024:0626"},{"url":"https://access.redhat.com/errata/RHSA-2024:0629","label":"RHSA-2024:0629"},{"url":"https://access.redhat.com/errata/RHSA-2024:2169","label":"RHSA-2024:2169"},{"url":"https://access.redhat.com/errata/RHSA-2024:2170","label":"RHSA-2024:2170"},{"url":"https://access.redhat.com/errata/RHSA-2024:2995","label":"RHSA-2024:2995"},{"url":"https://access.redhat.com/errata/RHSA-2024:2996","label":"RHSA-2024:2996"},{"url":"https://access.redhat.com/errata/RHSA-2025:12751","label":"RHSA-2025:12751"},{"url":"https://access.redhat.com/security/cve/CVE-2024-21885"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2256540","label":"RHBZ#2256540"}],"tags":["cve.org"],"epss":0.0142,"epssPercentile":0.7291,"ingestedAt":"2026-11-05T21:36:00.601Z","slug":"CVE-2024-21885","body":"## Overview\n\nA flaw was found in X.Org server. In the XISendDeviceHierarchyEvent function, it is possible to exceed the allocated array length when certain new device IDs are added to the xXIHierarchyInfo struct. This can trigger a heap buffer overflow condition, which may lead to an application crash or remote code execution in SSH X11 forwarding environments.\n\n## Affected\n\n- `xorg-server < 21.1.11`\n- `xwayland < 23.2.4`\n- `tigervnc (all versions)`\n- `xorg-x11-server (all versions)`\n- `tigervnc (all versions)`\n- `tigervnc (all versions)`\n- `xorg-x11-server (all versions)`\n- `xorg-x11-server-Xwayland (all versions)`\n- `tigervnc (all versions)`\n- `tigervnc (all versions)`\n- `tigervnc (all versions)`\n- `tigervnc (all versions)`\n- `tigervnc (all versions)`\n- `tigervnc (all versions)`\n- `tigervnc (all versions)`\n- `tigervnc (all versions)`\n- `tigervnc (all versions)`\n- `xorg-x11-server (all versions)`\n- `xorg-x11-server-Xwayland (all versions)`\n- `tigervnc (all versions)`\n- `tigervnc (all versions)`\n- `xorg-x11-server`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n### Workarounds\n\nMitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0.3,"exploitation":0,"ransomware":0},"changes":[]}