{"id":"CVE-2024-21886","title":"Xorg-x11-server: heap buffer overflow in disabledevice","summary":"A heap buffer overflow flaw was found in the DisableDevice function in the X.Org server. This issue may lead to an application crash or, in some circumstances, remote code execution in SSH X11 forwarding environments.","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 1.21.1.7","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":"yes","technicalImpact":"partial","timestamp":"2024-04-23T21:47:31.702467Z"},"published":"2024-02-28","updated":"2026-11-04","sourceUpdated":"2026-11-04T21:10:05.254Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2024-21886","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-2024-21886"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2256542","label":"RHBZ#2256542"}],"tags":["cve.org"],"epss":0.0142,"epssPercentile":0.7291,"ingestedAt":"2026-11-05T21:36:00.600Z","slug":"CVE-2024-21886","body":"## Overview\n\nA heap buffer overflow flaw was found in the DisableDevice function in the X.Org server. This issue may lead to an application crash or, in some circumstances, remote code execution in SSH X11 forwarding environments.\n\n## Affected\n\n- `xorg-server 1.21.1.7`\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":[]}